MQL5 ReferenceStandard LibraryPanels and DialogsCButtonOnMouseUp CreatePressedLockingOnSetTextOnSetColorOnSetColorBackgroundOnSetColorBorderOnSetFontOnSetFontSizeOnCreateOnShowOnHideOnMoveOnResizeOnMouseDownOnMouseUp 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. OnMouseDown CEdit