diff --git a/src/main_gui.cpp b/src/main_gui.cpp
--- a/src/main_gui.cpp
+++ b/src/main_gui.cpp
@@ -186,6 +186,7 @@ enum {
 	GHK_CONSOLE,
 	GHK_BOUNDING_BOXES,
 	GHK_DIRTY_BLOCKS,
+	GHK_WIDGET_OUTLINES,
 	GHK_CENTER,
 	GHK_CENTER_ZOOM,
 	GHK_RESET_OBJECT_TO_PLACE,
@@ -307,6 +308,10 @@ struct MainWindow : Window
 			case GHK_DIRTY_BLOCKS:
 				ToggleDirtyBlocks();
 				return ES_HANDLED;
+
+			case GHK_WIDGET_OUTLINES:
+				ToggleWidgetOutlines();
+				return ES_HANDLED;
 		}
 
 		if (_game_mode == GM_MENU) return ES_NOT_HANDLED;
@@ -467,6 +472,7 @@ struct MainWindow : Window
 		Hotkey(WKC_BACKQUOTE, "console", GHK_CONSOLE),
 		Hotkey('B' | WKC_CTRL, "bounding_boxes", GHK_BOUNDING_BOXES),
 		Hotkey('I' | WKC_CTRL, "dirty_blocks", GHK_DIRTY_BLOCKS),
+		Hotkey('O' | WKC_CTRL, "widget_outlines", GHK_WIDGET_OUTLINES),
 		Hotkey('C', "center", GHK_CENTER),
 		Hotkey('Z', "center_zoom", GHK_CENTER_ZOOM),
 		Hotkey(WKC_ESC, "reset_object_to_place", GHK_RESET_OBJECT_TO_PLACE),