add missing GetVeto method

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@75624 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775
Add missing GetControl and SetControl methods

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@75625 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775