Fix in design Panel -> element was null

src/AddIns/DisplayBindings/WpfDesign/WpfDesign.Designer/Project/DesignPanel.cs

@@ -50,12 +50,13 @@ namespace ICSharpCode.WpfDesign.Designer
 				if (!(element.IsHitTestVisible && element.Visibility == Visibility.Visible)) {
 					return HitTestFilterBehavior.ContinueSkipSelfAndChildren;
 				}
-			}
 				
-			var designItem = Context.Services.Component.GetDesignItem(element) as XamlDesignItem;
+				var designItem = Context.Services.Component.GetDesignItem(element) as XamlDesignItem;
+			
+				if (designItem != null && designItem.IsDesignTimeLocked) {
+					return HitTestFilterBehavior.ContinueSkipSelfAndChildren;
+			}
 			
-			if (designItem != null && designItem.IsDesignTimeLocked) {
-				return HitTestFilterBehavior.ContinueSkipSelfAndChildren;
 			}
 						
 			return HitTestFilterBehavior.Continue;