Actually, the calling form contains 1 Treeview, 1 ListView, 1 CommonDialog and 2 imageList controls, This form call an other form when the user Double click on one of the list view item. I dont create an object ref when calling the form. Have you ever seen something remotly like this ?

Thanks

>Stephane,
>
>Are you using ActiveX controls on the form? Are you using object references that you are not properly cleaning up when form closes?
>
>>Hi All
>>
>>When a run a form and close it many times (open and close about 20 times ) Without doing anything else i get this first illegal operation: