Use of DT_SetBackgroundColor for a control

[ssimop]

Thank you very much. It is very likely that I misunderstood on what one reads in QM help file with lemma : DT_SetBackgroundColor :

Can be any window, not necessary a dialog

Nevertheless, I have used successfully DT_SetTextColor to set the color of the font in a dialog control (static & edit). I experienced that it does not work in the case of the font of a button, for example OK or Cancel. Any comment on this will be appreciated.
Best regards.