MQL5 ReferenceStandard LibraryPanels and DialogsCDialogOnDialogDragStart CreateOnEventCaptionAddCreateWhiteBorderCreateBackgroundCreateCaptionCreateButtonCloseCreateClientAreaOnClickCaptionOnClickButtonCloseClientAreaVisibleClientAreaLeftClientAreaTopClientAreaRightClientAreaBottomClientAreaWidthClientAreaHeightOnDialogDragStartOnDialogDragProcessOnDialogDragEnd OnDialogDragStart The virtual handler of the control "DialogDragStart" event. virtual bool OnDialogDragStart() Return Value true - event processed, otherwise - false. Note The "DialogDragStart" event occurs at start of the drag of the control. ClientAreaHeight OnDialogDragProcess