diff --git a/src/core/settings.cpp b/src/core/settings.cpp
index 40e06dd51..1d332721f 100644
--- a/src/core/settings.cpp
+++ b/src/core/settings.cpp
@@ -44,12 +44,12 @@ QSettings::Status Settings::checkSettings() {
   return s_instance->status();
 }
 
-Settings &Settings::getInstance() {
+Settings *Settings::getInstance() {
   if (s_instance.isNull()) {
     setupSettings();
   }
 
-  return *s_instance;
+  return s_instance;
 }
 
 QVariant Settings::value(const QString &section,
diff --git a/src/core/settings.h b/src/core/settings.h
index 368ca013b..6771d304f 100644
--- a/src/core/settings.h
+++ b/src/core/settings.h
@@ -10,7 +10,7 @@ class Settings : public QSettings {
 
   public:
     // Singleton getter.
-    static Settings &getInstance();
+    static Settings *getInstance();
 
     // Constructor and destructor.
     Settings(const QString & file_name, Format format, QObject * parent = 0);
diff --git a/src/gui/formmain.cpp b/src/gui/formmain.cpp
index 0244e1382..fa022134c 100644
--- a/src/gui/formmain.cpp
+++ b/src/gui/formmain.cpp
@@ -1,23 +1,41 @@
 // for testing
 #include <QMessageBox>
+#include <QProcess>
 
 #include "gui/formmain.h"
 #include "gui/formsettings.h"
 #include "gui/themefactory.h"
+#include "gui/systemtrayicon.h"
 #include "core/settings.h"
+#include "core/defs.h"
 #include "qtsingleapplication/qtsingleapplication.h"
 
 
+FormMain *FormMain::m_this;
+
 FormMain::FormMain(QWidget *parent) : QMainWindow(parent), m_ui(new Ui::FormMain) {
   m_ui->setupUi(this);
 
+  // Initialize singleton.
+  m_this = this;
+
+  // Establish connections.
   createConnections();
+
+  // testing purposes
+  SystemTrayIcon *icon = SystemTrayIcon::getInstance();
+  icon->setIcon(QIcon(APP_ICON_PATH));
+  icon->show();
 }
 
 FormMain::~FormMain() {
   delete m_ui;
 }
 
+FormMain *FormMain::getInstance() {
+  return m_this;
+}
+
 void FormMain::processExecutionMessage(const QString &message) {
   // TODO: Implement proper reaction when application is launched more than once.
   qDebug("Received '%s' execution message from another application instance.",
diff --git a/src/gui/formmain.h b/src/gui/formmain.h
index 1da197ca3..fcc9afe89 100644
--- a/src/gui/formmain.h
+++ b/src/gui/formmain.h
@@ -13,6 +13,8 @@ class FormMain : public QMainWindow {
     explicit FormMain(QWidget *parent = 0);
     ~FormMain();
 
+    static FormMain *getInstance();
+
   protected:
     void createConnections();
 
@@ -33,6 +35,8 @@ class FormMain : public QMainWindow {
     
   private:
     Ui::FormMain *m_ui;
+
+    static FormMain *m_this;
 };
 
 #endif // FORMMAIN_H
diff --git a/src/gui/formsettings.cpp b/src/gui/formsettings.cpp
index 6351af10e..77d67aac9 100644
--- a/src/gui/formsettings.cpp
+++ b/src/gui/formsettings.cpp
@@ -1,6 +1,8 @@
 #include "gui/formsettings.h"
 #include "gui/themefactory.h"
+#include "gui/systemtrayicon.h"
 #include "core/settings.h"
+#include "core/defs.h"
 
 
 FormSettings::FormSettings(QWidget *parent) : QDialog(parent), m_ui(new Ui::FormSettings) {
@@ -27,10 +29,27 @@ void FormSettings::saveSettings() {
   //saveLanguages();
 
   // Make sure that settings is synced.
-  Settings::getInstance().checkSettings();
+  Settings::getInstance()->checkSettings();
 }
 
 void FormSettings::loadInterface() {
+  // Load settings of tray icon.
+  if (SystemTrayIcon::isSystemTrayAvailable()) {
+    // načti
+    m_ui->m_radioTrayOff->setChecked(!Settings::getInstance()->value(APP_CFG_GUI,
+                                                                     "use_tray_icon",
+                                                                     true).toBool());
+    m_ui->m_cmbTrayClose->setCurrentIndex(Settings::getInstance()->value(APP_CFG_GUI,
+                                                                         "close_win_action",
+                                                                         0).toInt());
+  }
+  else {
+    m_ui->m_radioTrayOff->setText(tr("disable (Tray icon is not available.)"));
+    m_ui->m_radioTrayOff->setChecked(true);
+    m_ui->m_grpTray->setDisabled(true);
+  }
+
+  // Load settings of icon theme.
   QString current_theme = ThemeFactory::getCurrentIconTheme();
 #if defined(Q_OS_LINUX)
   QString system_theme = ThemeFactory::getSystemIconTheme();
@@ -64,6 +83,17 @@ void FormSettings::loadInterface() {
 }
 
 void FormSettings::saveInterface() {
+  // Save tray icon.
+  if (SystemTrayIcon::isSystemTrayAvailable()) {
+    Settings::getInstance()->setValue(APP_CFG_GUI, "use_tray_icon",
+                                      m_ui->m_radioTrayOn->isChecked());
+    Settings::getInstance()->setValue(APP_CFG_GUI, "close_win_action",
+                                      m_ui->m_cmbTrayClose->currentIndex());
+    // TODO: Switch tray icon here (destroy it/create it) and
+    // if icon is should be destroyed and no main window is visible,
+    // then show main window and then destroy tray icon.
+  }
+
   // Save selected icon theme.
   ThemeFactory::setCurrentIconTheme(m_ui->m_cmbIconTheme->itemData(m_ui->m_cmbIconTheme->currentIndex()).toString());
 }
diff --git a/src/gui/formsettings.ui b/src/gui/formsettings.ui
index 7e2f0c0f0..0dc6c5e09 100644
--- a/src/gui/formsettings.ui
+++ b/src/gui/formsettings.ui
@@ -6,8 +6,8 @@
    <rect>
     <x>0</x>
     <y>0</y>
-    <width>586</width>
-    <height>355</height>
+    <width>680</width>
+    <height>414</height>
    </rect>
   </property>
   <property name="windowTitle">
@@ -23,7 +23,7 @@
       </size>
      </property>
      <property name="currentRow">
-      <number>0</number>
+      <number>-1</number>
      </property>
      <item>
       <property name="text">
@@ -35,6 +35,11 @@
        <string>User interface</string>
       </property>
      </item>
+     <item>
+      <property name="text">
+       <string>Language</string>
+      </property>
+     </item>
     </widget>
    </item>
    <item row="0" column="1">
@@ -45,23 +50,30 @@
      <widget class="QWidget" name="m_pageGeneral"/>
      <widget class="QWidget" name="m_pageUi">
       <layout class="QHBoxLayout" name="horizontalLayout">
+       <property name="leftMargin">
+        <number>0</number>
+       </property>
+       <property name="topMargin">
+        <number>0</number>
+       </property>
+       <property name="rightMargin">
+        <number>0</number>
+       </property>
+       <property name="bottomMargin">
+        <number>0</number>
+       </property>
        <item>
-        <widget class="QScrollArea" name="m_scrollUi">
-         <property name="frameShape">
-          <enum>QFrame::NoFrame</enum>
+        <widget class="QTabWidget" name="m_tabUi">
+         <property name="tabPosition">
+          <enum>QTabWidget::North</enum>
          </property>
-         <property name="widgetResizable">
-          <bool>true</bool>
+         <property name="currentIndex">
+          <number>0</number>
          </property>
-         <widget class="QWidget" name="m_scrollUiContents">
-          <property name="geometry">
-           <rect>
-            <x>0</x>
-            <y>0</y>
-            <width>394</width>
-            <height>290</height>
-           </rect>
-          </property>
+         <widget class="QWidget" name="m_tabIconSkin">
+          <attribute name="title">
+           <string>Icons &amp;&amp; skins</string>
+          </attribute>
           <layout class="QFormLayout" name="formLayout">
            <item row="0" column="0">
             <widget class="QLabel" name="m_lblIconTheme">
@@ -76,12 +88,82 @@
            <item row="0" column="1">
             <widget class="QComboBox" name="m_cmbIconTheme"/>
            </item>
+           <item row="1" column="0">
+            <widget class="QLabel" name="m_lblSkin">
+             <property name="text">
+              <string>Skin</string>
+             </property>
+            </widget>
+           </item>
+           <item row="1" column="1">
+            <widget class="QComboBox" name="m_cmbSkin"/>
+           </item>
           </layout>
          </widget>
+         <widget class="QWidget" name="tab_3">
+          <attribute name="title">
+           <string>Notifications</string>
+          </attribute>
+          <layout class="QFormLayout" name="formLayout_3">
+           <item row="0" column="0" colspan="2">
+            <widget class="QGroupBox" name="m_grpTray">
+             <property name="title">
+              <string>Tray icon</string>
+             </property>
+             <layout class="QFormLayout" name="formLayout_2">
+              <item row="0" column="0" colspan="2">
+               <widget class="QRadioButton" name="m_radioTrayOff">
+                <property name="text">
+                 <string>disable</string>
+                </property>
+               </widget>
+              </item>
+              <item row="1" column="0" colspan="2">
+               <widget class="QRadioButton" name="m_radioTrayOn">
+                <property name="text">
+                 <string>enable</string>
+                </property>
+                <property name="checked">
+                 <bool>true</bool>
+                </property>
+               </widget>
+              </item>
+              <item row="2" column="0">
+               <widget class="QLabel" name="m_lblTrayClose">
+                <property name="text">
+                 <string>When main window is closed, then</string>
+                </property>
+               </widget>
+              </item>
+              <item row="2" column="1">
+               <widget class="QComboBox" name="m_cmbTrayClose">
+                <item>
+                 <property name="text">
+                  <string>minimize it.</string>
+                 </property>
+                </item>
+                <item>
+                 <property name="text">
+                  <string>quit the application.</string>
+                 </property>
+                </item>
+               </widget>
+              </item>
+             </layout>
+            </widget>
+           </item>
+          </layout>
+         </widget>
+         <widget class="QWidget" name="m_tabFonts">
+          <attribute name="title">
+           <string>Fonts</string>
+          </attribute>
+         </widget>
         </widget>
        </item>
       </layout>
      </widget>
+     <widget class="QWidget" name="m_pageLanguage"/>
     </widget>
    </item>
    <item row="1" column="0" colspan="2">
@@ -146,5 +228,69 @@
     </hint>
    </hints>
   </connection>
+  <connection>
+   <sender>m_radioTrayOff</sender>
+   <signal>toggled(bool)</signal>
+   <receiver>m_lblTrayClose</receiver>
+   <slot>setDisabled(bool)</slot>
+   <hints>
+    <hint type="sourcelabel">
+     <x>370</x>
+     <y>82</y>
+    </hint>
+    <hint type="destinationlabel">
+     <x>292</x>
+     <y>135</y>
+    </hint>
+   </hints>
+  </connection>
+  <connection>
+   <sender>m_radioTrayOff</sender>
+   <signal>toggled(bool)</signal>
+   <receiver>m_cmbTrayClose</receiver>
+   <slot>setDisabled(bool)</slot>
+   <hints>
+    <hint type="sourcelabel">
+     <x>370</x>
+     <y>82</y>
+    </hint>
+    <hint type="destinationlabel">
+     <x>478</x>
+     <y>135</y>
+    </hint>
+   </hints>
+  </connection>
+  <connection>
+   <sender>m_radioTrayOn</sender>
+   <signal>toggled(bool)</signal>
+   <receiver>m_lblTrayClose</receiver>
+   <slot>setVisible(bool)</slot>
+   <hints>
+    <hint type="sourcelabel">
+     <x>370</x>
+     <y>108</y>
+    </hint>
+    <hint type="destinationlabel">
+     <x>292</x>
+     <y>135</y>
+    </hint>
+   </hints>
+  </connection>
+  <connection>
+   <sender>m_radioTrayOn</sender>
+   <signal>toggled(bool)</signal>
+   <receiver>m_cmbTrayClose</receiver>
+   <slot>setVisible(bool)</slot>
+   <hints>
+    <hint type="sourcelabel">
+     <x>370</x>
+     <y>108</y>
+    </hint>
+    <hint type="destinationlabel">
+     <x>478</x>
+     <y>135</y>
+    </hint>
+   </hints>
+  </connection>
  </connections>
 </ui>
diff --git a/src/gui/systemtrayicon.cpp b/src/gui/systemtrayicon.cpp
index 409929aa2..648322357 100644
--- a/src/gui/systemtrayicon.cpp
+++ b/src/gui/systemtrayicon.cpp
@@ -1,5 +1,34 @@
 #include "gui/systemtrayicon.h"
+#include "gui/formmain.h"
+#include "core/settings.h"
+#include "core/defs.h"
 
 
+QPointer<SystemTrayIcon> SystemTrayIcon::m_trayIcon;
+
 SystemTrayIcon::SystemTrayIcon(QObject *parent) : QSystemTrayIcon(parent) {
+  qDebug("Creating SystemTrayIcon instance.");
 }
+
+SystemTrayIcon::~SystemTrayIcon() {
+  qDebug("Destroying SystemTrayIcon instance.");
+}
+
+bool SystemTrayIcon::isSystemTrayAvailable() {
+  return QSystemTrayIcon::isSystemTrayAvailable() && QSystemTrayIcon::supportsMessages();
+}
+
+bool SystemTrayIcon::isSystemTrayActivated() {
+  return SystemTrayIcon::isSystemTrayAvailable() && Settings::getInstance()->value(APP_CFG_GUI,
+                                                                                   "use_tray_icon",
+                                                                                   true).toBool();
+}
+
+SystemTrayIcon *SystemTrayIcon::getInstance() {
+  if (m_trayIcon.isNull()) {
+    m_trayIcon = new SystemTrayIcon(FormMain::getInstance());
+  }
+
+  return m_trayIcon;
+}
+
diff --git a/src/gui/systemtrayicon.h b/src/gui/systemtrayicon.h
index d070c308d..d0096e398 100644
--- a/src/gui/systemtrayicon.h
+++ b/src/gui/systemtrayicon.h
@@ -2,17 +2,34 @@
 #define SYSTEMTRAYICON_H
 
 #include <QSystemTrayIcon>
+#include <QPointer>
 
 
 class SystemTrayIcon : public QSystemTrayIcon {
     Q_OBJECT
   public:
     explicit SystemTrayIcon(QObject *parent = 0);
+    ~SystemTrayIcon();
+
+    // Returns true if tray icon CAN be constructed on this machine.
+    static bool isSystemTrayAvailable();
+
+    // Returns true if tray icon CAN be costructed and IS enabled in
+    // application settings.
+    static bool isSystemTrayActivated();
+
+    // Creates new tray icon if necessary and returns it.
+    // WARNING: Use this in cooperation with SystemTrayIcon::isSystemTrayActivated().
+    static SystemTrayIcon *getInstance();
     
+    // TODO: Implement method for manual clearing of the tray icon. Creating of tray icon
+    // handled by getInstance().
   signals:
     
   public slots:
-    
+
+  private:
+    static QPointer<SystemTrayIcon> m_trayIcon;
 };
 
 #endif // SYSTEMTRAYICON_H
diff --git a/src/gui/themefactory.cpp b/src/gui/themefactory.cpp
index 62b6c04c9..f9eb95b75 100644
--- a/src/gui/themefactory.cpp
+++ b/src/gui/themefactory.cpp
@@ -62,16 +62,16 @@ QString ThemeFactory::getSystemIconTheme() {
 }
 
 QString ThemeFactory::getCurrentIconTheme() {
-  QString current_theme_name = Settings::getInstance().value(APP_CFG_GUI,
-                                                             "icon_theme",
-                                                             getSystemIconTheme()).toString();
+  QString current_theme_name = Settings::getInstance()->value(APP_CFG_GUI,
+                                                              "icon_theme",
+                                                              getSystemIconTheme()).toString();
   return current_theme_name;
 }
 
 void ThemeFactory::setCurrentIconTheme(const QString &theme_name) {
-  Settings::getInstance().setValue(APP_CFG_GUI,
-                                   "icon_theme",
-                                   theme_name);
+  Settings::getInstance()->setValue(APP_CFG_GUI,
+                                    "icon_theme",
+                                    theme_name);
   loadCurrentIconTheme();
 }
 
diff --git a/src/main.cpp b/src/main.cpp
index 847e12e0c..716584723 100644
--- a/src/main.cpp
+++ b/src/main.cpp
@@ -65,13 +65,12 @@ int main(int argc, char *argv[]) {
   QtSingleApplication::setOrganizationName(APP_AUTHORS);
   QtSingleApplication::setOrganizationDomain(APP_URL);
   QtSingleApplication::setWindowIcon(QIcon(APP_INFO_PATH));
-  qDebug("%s", qPrintable(APP_ICON_PATH));
 
   // Instantiate main application window.
   FormMain window;
 
-  if (Settings::getInstance().value(APP_CFG_GEN, "first_start", true).toBool()) {
-    Settings::getInstance().setValue(APP_CFG_GEN, "first_start", false);
+  if (Settings::getInstance()->value(APP_CFG_GEN, "first_start", true).toBool()) {
+    Settings::getInstance()->setValue(APP_CFG_GEN, "first_start", false);
     FormWelcome(&window).exec();
   }