MQL5 ReferenceStandard LibraryPanels and DialogsCCheckGroupCreateButton CreateOnEventAddItemValueCreateButtonOnVScrollShowOnVScrollHideOnScrollLineDownOnScrollLineUpOnChangeItemRedrawRowState CreateButton Creates new CCheckBox class instance at a specified index. bool CreateButton( int index // index ) Parameters index [in] Index of the new item in the CCheckGroup. Return Value true - successful, otherwise - false. Value OnVScrollShow