In order to override TPanel's Paint procedure to make the background color clwhite in delphi 7, I am following @RRUZ Answer, but I can't find the TCustomStyleServices class.
There is an alternative to do what I want?
I'm using XPMan resource (IDK if changes anything).
Since Delphi7 does not support VCL-Styles, setting Parentbackground to false and Color to clWhite should fit your requirements.