using Destroy, as otherwise the remnants get into the way for some other tests

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@74194 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775
wait for the frame window to be really done on OSX before starting

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@74195 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775
slight adaption, shorter max wait

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@74196 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775