For a pushbuttoncontrol, a state change means that while the mouse button is down and directly over the control, the button will enter and remain in the pushed state.
钮控件，状态改变意味着当鼠标按键在控件之上按下时，按钮进入或保持按下的状态。
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The most common examples of this problem actually occur with Visual Basic, where it is common for programmers to attach 10k script to a single control, like a pushbutton.