Fix a problem with new style when using SetBackgroundPixmap() with flat buttons. To be able to set (and keep) a pixmap as background, one should set the kOwnBackground flag. E.g.:     fButton->ChangeOptions(fButton->GetOptions() | kOwnBackground);
Fix a problem with new style when using SetBackgroundPixmap() with flat buttons. To be able to set (and keep) a pixmap as background, one should set the kOwnBackground flag. E.g.: 
   fButton->ChangeOptions(fButton->GetOptions() | kOwnBackground);


git-svn-id: acec3fd5b7ea1eb9e79d6329d318e8118ee2e14f@42940 27541ba8-7e3a-0410-8455-c3a389f83636

bbockelm/root-historical,bbockelm/root-historical,bbockelm/root-historical,bbockelm/root-historical,bbockelm/root-historical,bbockelm/root-historical,bbockelm/root-historical