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Created attachment 1285 [details]
Sample code that illustrates the problem
Description of Problem:
When a timer draws something in the "background tab" it becomes visible on all tabs.
Steps to reproduce the problem:
1. Open Sample app. It adds a new line of text every second to a textbox on a "Logi" tab.
2. Switch to "Logi" tab.
3. Switch to any other tab. The text will be rendered every second on every tab.
Inability to use TabControl
How often does this happen?
Selection of "Logi" tab is essential. Without it everything works as expected.
this occur on any control that has multiple levels. and only happens on Mac
Created attachment 2215 [details]
another sample with the problem
problem does not occur with
This might be related with the Paint event being triggered for controls that are on hidden panels. See bug #15539. Most tabs are implemented with showing/hiding panels for each tab.