You'll have to enumerate the Control collection of the MdiParent form. Look for a control of Type "MdiClient". When you find it, you can call it's SetBounds method or set it's Location to appropriate values.
For Each c As Control In MyMdiParent.Controls
If TypeOf c Is MdiClient Then
Dim client As MdiClient = DirectCast(c, MdiClient)
client.Location = New Point(...)
Exit For
End If
Next
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Dave Kreskowiak Microsoft MVP Visual Developer - Visual Basic
2006, 2007, 2008