Hello,

"i don't understand it at all, but i'll try it a bunch more times and hope it works."

The purpose of the function is to tell the OS that a particular Rectangle in a window has to be repainted, by passing 0 as the lpRect parameter it's telling the OS to invalidate/'force a redraw' of the whole window.

Nice if it works .. it was just a good guess since Foxpro handles drawing of windows differently than any other standard windows applications.
To be more specific, FoxPro controls are not real windows (that's why they don't have a Hwnd property), instead FoxPro uses it's own drawing engine to draw the controls directly onto the Form/Window (for some historical reason's i don't remember well .. i think it was either a performance reason or introduced so the code could be used crossplatform (many years back when FoxPro X.0 was able to also run on Unix/Mac machines))

in C(++) and all other development environments that i know of the controls you put on a form are real childwindows of the form

you may try leaving out the THISFORM.Refresh(), should work also.

Regards
Christian