Pixels

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Hi that doesn't do what i want, i have a window that white pops up all the time i want to just count it 49 times then i want to click a button after it has popped up the 50th time i hope u can understand what i want.
the code u just gave me clicks the button everytime the color disappears..the only time i want to click the button is on the 50th time the color white has been on the window .
thanks