diff --git a/Evergreen/Inspector/InspectorWindowController.swift b/Evergreen/Inspector/InspectorWindowController.swift
index 0b965024e..c350b6b18 100644
--- a/Evergreen/Inspector/InspectorWindowController.swift
+++ b/Evergreen/Inspector/InspectorWindowController.swift
@@ -32,10 +32,6 @@ final class InspectorWindowController: NSWindowController {
 		}
 	}
 
-	var isOpen: Bool {
-		return isWindowLoaded && window!.isVisible
-	}
-
 	private var inspectors: [InspectorViewController]!
 
 	private var currentInspector: InspectorViewController! {
diff --git a/Evergreen/MainWindow/MainWindowController.swift b/Evergreen/MainWindow/MainWindowController.swift
index 73b260216..a9f93c8fd 100644
--- a/Evergreen/MainWindow/MainWindowController.swift
+++ b/Evergreen/MainWindow/MainWindowController.swift
@@ -16,10 +16,6 @@ private let kWindowFrameKey = "MainWindow"
 
 class MainWindowController : NSWindowController, NSUserInterfaceValidations {
 
-	var isOpen: Bool {
-		return isWindowLoaded && window!.isVisible
-	}
-
 	// MARK: NSWindowController
 
 	private let windowAutosaveName = NSWindow.FrameAutosaveName(rawValue: kWindowFrameKey)
diff --git a/Frameworks/RSCore/RSCore/AppKit/NSWindowController+RSCore.swift b/Frameworks/RSCore/RSCore/AppKit/NSWindowController+RSCore.swift
index f35bc9f18..61cdc263e 100644
--- a/Frameworks/RSCore/RSCore/AppKit/NSWindowController+RSCore.swift
+++ b/Frameworks/RSCore/RSCore/AppKit/NSWindowController+RSCore.swift
@@ -14,4 +14,9 @@ public extension NSWindowController {
 
 		return window?.isDisplayingSheet ?? false
 	}
+
+	public var isOpen: Bool {
+
+		return isWindowLoaded && window!.isVisible
+	}
 }