That seems to be by design: (from help on dblClick)
For this event to occur, the two clicks must occur within the time span
specified by the system's double-click speed setting.
For controls that support Click, the following sequence of events leads to
the DblClick event:
If a control, such as TextBox, does not support Click, Click is omitted fom
the order of events leading to the DblClick event.
Perhaps use Right Click for the second action.
"John Paul Fullerton" <John Paul XXXX@XXXXX.COM > wrote