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Strrange behavior using masked edit

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Last Modified: 2016-07-22
I have simple Windows form (not WEB app), a test app for this problem.  It has a masked Edit and a button.  mask is "00000000" (8 zeroes) and prompt char is a space, because I don't want a prompt char.  In button click event, I set the focus to the text box because in my real app depending on what the user enters, I do not close my dialog and instead force them to reenter data.   I can click the button all day and all is fine - textbox get focus.  However, if I use the mouse to click in the text box, I get 8 space (size of the mask) inserted into the text box.   Why? I don't get it??  See image.  I can tell this happens by seeing  the blinking cursor.  


spaces in textbox.
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