Removing a Custom control from Ribbon Bar

i have added a datepicker to a ribbongroup using this
Set custControl = grp.Add(XtremeCommandBars.XTPControlType.xtpControlCustom, ID_TOOL_APPTS_DTPICKER, "Date Picker")
   
    custControl.Handle = dtpDateView.hWnd

if i then call DeleteAll on the group or try to remove the group completely from the ribbon the datetimepicker is still left behind.
How do i remove the custom control from the ribbon



thanks