MQL5 ReferenceStandard LibraryPanels and DialogsCComboBoxOnClickButton CreateOnEventAddItemListViewItemsSelectSelectByTextSelectByValueValueCreateEditCreateButtonCreateListOnClickEditOnClickButtonOnChangeListListShowListHide OnClickButton The virtual handler of the "ClickButton" (mouse click on the button) internal event. virtual bool OnClickButton() Return Value true - event processed, otherwise - false. OnClickEdit OnChangeList