[Bug 40390] When using a UX theme, owner-drawn buttons don' t draw until you click them once

https://bugs.winehq.org/show_bug.cgi?id=40390

--- Comment #1 from [e-mail] ---
I just determined that if I disable theming on the individual owner-draw
buttons after I create them by calling SetWindowTheme(hWnd, L" ", L" "), owner
drawn buttons work normally with a theme selected.

This seems to work consistently for pushbuttons that I create myself.  But for 
pushbuttons defined with BS_OWNERDRAW on dialogs defined in my .rc file, it's
inconsistent.  For those, I tried adding calls to

SetWindowTheme(GetDlgItem(hDlg, <button_id>), L" ", L" ");

in my M_INITDIALOG handler.  Works on some dialogs and not on others.