I have to modify the demo a little bit to show the problem. The problem is not seen every time. Push the button1 and then move with the mouse over the buttons2 a few times. Then click on a button2. Mostly the first time the afterglow is not seen. But when you repeat the steps en close with an other button2 the afterglow appears. Some time you have to repeat is again and again to see it.
I hope you can find a solution.
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