I don't see this. The button stays in place and visible all the time as it should be.

>For testing purposes I've created a form (not subclassed) with one button (not subclassed) and in the form init I have...
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>this.line(10,10,20,20)
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>When I run the form the line and button are there. As soon as the mouse cursor moves over the button the button disappears. If I move over where the button was it then appears but disappears when I move back off. There is no code in any button methods except "click" which does "thisform.release" and like I said, nothing is subclassed. Is using the line method on init not a good thing to do?