Finding the closest info bar to copy the background colour from only worked
for very simple layouts and failed for more complicated ones with nested
sizers so don't try to change the colour automatically, it's easy enough to do
it manually as shown in the updated dialogs sample.
git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@62301 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775
15ea6e205b