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/msw/button.cpp

@@ -343,14 +343,10 @@ wxSize wxButtonBase::GetDefaultSize()
  */
 
 // set this button as the (permanently) default one in its panel
-void wxButton::SetDefault()
+wxWindow *wxButton::SetDefault()
 {
-    wxTopLevelWindow *tlw = wxDynamicCast(wxGetTopLevelParent(this), wxTopLevelWindow);
-
-    wxCHECK_RET( tlw, _T("button without top level window?") );
-
     // set this one as the default button both for wxWidgets ...
-    wxWindow *winOldDefault = tlw->SetDefaultItem(this);
+    wxWindow *winOldDefault = wxButtonBase::SetDefault();
 
     // ... and Windows
     SetDefaultStyle(wxDynamicCast(winOldDefault, wxButton), false);