There's nothing mysterious abou that. The HiTest() returns value in twips. See Re: TreeView.HitTest returns invalid reference Message #882350

>Oh, I found that under some conditions HitTest needs coordinates multiplied by 15. (AFAIK to convert from pixels to VB units but I'm not sure).
>Very weird thing.
>
>Please try this modified code:
>

>LOCAL laMice[4]
>IF AMOUSEOBJ(laMice) = 4 THEN
>  IF NOT ISNULL(This.HitTest(15*laMice[3], 15*laMice[4])) THEN
>    * Doubleclick action
>  ENDIF
>ENDIF
>

>
>Hope this helps.