src/windows/classes/sun/awt/windows/WWindowPeer.java

*** 200,218 ****
  
      private volatile Window.Type windowType = Window.Type.NORMAL;
  
      // This method must be called for Window, Dialog, and Frame before creating
      // the hwnd
!     void preCreate(WComponentPeer parent) {
          windowType = ((Window)target).getType();
      }
  
      void create(WComponentPeer parent) {
!         preCreate(parent);
          createAwtWindow(parent);
      }
  
      // should be overriden in WDialogPeer
      protected void realShow() {
          super.show();
      }
  
--- 200,224 ----
  
      private volatile Window.Type windowType = Window.Type.NORMAL;
  
      // This method must be called for Window, Dialog, and Frame before creating
      // the hwnd
!     final void preCreate() {
          windowType = ((Window)target).getType();
      }
  
      void create(WComponentPeer parent) {
!         preCreate();
          createAwtWindow(parent);
      }
  
+     @Override
+     final WComponentPeer getNativeParent() {
+         final Container parent = ((Window) target).getOwner();
+         return (WComponentPeer) WToolkit.targetToPeer(parent);
+     }
+ 
      // should be overriden in WDialogPeer
      protected void realShow() {
          super.show();
      }