Fixes problem where child window does not appear immediately (until second child is added) in the WINDOWS menu.

OGL Studio sample did not even show the child frame when a new one was created [bug reported by Julian].
This patch supplied by Markus Greither


git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@9901 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

src/msw/mdi.cpp

@@ -726,14 +726,6 @@ bool wxMDIChildFrame::Create(wxMDIParentFrame *parent,
 
   wxModelessWindows.Append(this);
 
-  // Necessary to make ResetWindowStyle() work
-  // and will be called eventually anyway 
-  Activate();
-
-  // Without this, a maximized child will still
-  // a double border around the child
-  ResetWindowStyle((void *)NULL); // Set the Client ExStyle right
-
   return TRUE;
 }
 
@@ -1011,6 +1003,8 @@ bool wxMDIChildFrame::HandleMDIActivate(long WXUNUSED(activate),
     wxActivateEvent event(wxEVT_ACTIVATE, activated, m_windowId);
     event.SetEventObject( this );
 
+    ResetWindowStyle((void *)NULL);
+
     return GetEventHandler()->ProcessEvent(event);
 }