Call wxTLW::SetDefaultItem() from wxButtonBase::SetDefault() instead of doing

it in wxButton implementations in (almost) all ports; changed its return type
to "wxWindow *" from "void" to accommodate the ports needing the old default
item (replaces part of patch 1696563)


git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@45338 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

src/os2/bmpbuttn.cpp

@@ -292,9 +292,4 @@ void wxBitmapButton::DrawButtonDisable( wxClientDC& rDC,
     wxDisableBitmap(rBmp, vGreyPen.GetColour().GetPixel());
 } // end of wxBitmapButton::DrawButtonDisable
 
-void wxBitmapButton::SetDefault()
-{
-    wxButton::SetDefault();
-}
-
 #endif // ndef for wxUSE_BMPBUTTON