>Hi all,
>
>I have a form with some containers on it. Some of the containers are inside of a larger container.
>On the small container objects are image objects that display the status of a container, if it is selected or not.
>
>When clicking on those containers they toggle between selected and unselected, that will make the image on the container visible or not.
>Sometimes, and irregularly, but frequently, during clicking on a container, white shapes appear on the form on certain places on the form, see attached image, I circled those white areas so you understand what I mean.
>
>I tried to limit my intake of LSD and other psychedelic drugs, but to no avail.
>I tried THISFORM.DRAW() but that does not do anything, although I would have imagined this to be the only solution.
>
>The white areas disappear as soon as I would resize the form. I hope someone has an idea what could be a solution for this.


I don't suggest this as a fix even if it works, but as a curiosity, if you set .Themes = .F., does that prevent it?

Also, one thing you might do after your Draw() code is add this:

DECLARE INTEGER InvalidateRect  IN WIN32API INTEGER hwnd, INTEGER ignore1, INTEGER ignore2
InvalidateRect(thisForm.hwnd, 0, 1)

That will force the window to repaint itself at the Windows OS level, and may help it "go away".