>>Thanks for your reply
>>i want use showdialog()
>
>
>okay then, do this:
>
>

>            Form2 newMDIChild = new Form2();
>            // Set the Parent Form of the Child window.
>            newMDIChild.MdiParent = this;
>            // Display the new form.
>            newMDIChild.ShowDialog();
>

Hmmm.. can a MdiChild form be both a MdiChild AND an MdiParent? I might try this to see what happens.
Tim