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mql5-skills/skills/mql5/references/docs/34-standardlibrary/3889-standardlibrary-controls-cbutton-cbuttononmouseup.md
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OnMouseUp

The virtual handler of control "MouseUp" (left mouse button release) event.

virtual bool  OnMouseUp()

Return Value

true - event processed, otherwise - false.

Note

The "MouseUp" event occurs when left mouse button is released on the control.