Flickering with new fix!

[byte-one]

This change

* Fix: samples\GradBrus.prg was failing when Alt was pressed or the mouse was clicked on a
radio or a checkbox. We have modified Class TControl Method HandleEvent() to solve it.

lets flickering the controls very strong! This solution is not so good!

SEE ALSO FOR A FIX: viewtopic.php?f=3&t=14527&p=98394#p98394