MQL5 ReferenceStandard LibraryPanels and DialogsCBmpButtonOnMouseUp CreateBorderBmpNamesBmpOffNameBmpOnNameBmpPassiveNameBmpActiveNamePressedLockingOnSetZOrderOnCreateOnShowOnHideOnMoveOnChangeOnActivateOnDeactivateOnMouseDownOnMouseUp OnMouseUp The virtual handler of control "MouseUp" (mouse button release) event. virtual bool OnMouseUp() Return Value true - event processed, otherwise - false. OnMouseDown CButton