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

include/wx/univ/button.h

@@ -89,7 +89,7 @@ public:
 
     virtual void SetImageLabel(const wxBitmap& bitmap);
     virtual void SetImageMargins(wxCoord x, wxCoord y);
-    virtual void SetDefault();
+    virtual wxWindow *SetDefault();
 
     virtual bool IsPressed() const { return m_isPressed; }
     virtual bool IsDefault() const { return m_isDefault; }