hack: hide the MDI parent frame by moving it off screen

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@29581 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

include/wx/mac/carbon/mdi.h

@@ -80,6 +80,8 @@ public:
   virtual void ActivateNext();
   virtual void ActivatePrevious();
 
+  virtual bool Show( bool show = true );
+
 protected:
 
   // TODO maybe have this member

src/mac/carbon/mdi.cpp

@@ -233,6 +233,22 @@ void wxMDIParentFrame::ActivatePrevious()
     // TODO
 }
 
+bool wxMDIParentFrame::Show( bool show )
+{
+    if ( !wxFrame::Show(show) )
+        return false;
+
+    // don't really show the MDI frame unless it has any children other than
+    // MDI children as it is pretty useless in this case
+    if ( show )
+    {
+        // TODO: check for other children
+        Move(-10000, -10000);
+    }
+
+    return true;
+}
+
 // Child frame
 
 wxMDIChildFrame::wxMDIChildFrame()