added wxTopLevelWindow::RequestUserAttention(); documented it and implemented it for MSW

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@29048 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

src/common/toplvcmn.cpp

@@ -265,4 +265,9 @@ void wxTopLevelWindowBase::DoUpdateWindowUI(wxUpdateUIEvent& event)
     }
 }
 
-// vi:sts=4:sw=4:et
+void wxTopLevelWindowBase::RequestUserAttention(int flags)
+{
+    // it's probably better than do nothing, isn't it?
+    Raise();
+}
+