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Sets a callback corresponding to a user double-click selection in list box.Parameters
CompList _CBcompListDblClick ( CompList _list_ fun [CompList u0 I] u1 _callback_ u0 _user_ ) 
Return value
_list_ any CompList _callback_ callback function on user item double-click selection (supplemental parameter is double-clicked item position) _user_ user parameter 
same CompListRemark
A double-click selection is always preceded by an usual click selection.