MDI form - close exception

Hi,
this is the situation...

Ive got a MDI form, from a menu that MDI form opens a child form:
 
dim fNew as frmNewJob= New frmNewJob
fNew.MdiParent = Me
fNew.Show()

Now, from this child i open another child of the MDI form:

dim frm as new OtherChildForm
frm.MdiParent = Me.MdiParent
frm.Show()

When this second form, opens, in the load event, im checking if that form contains any data. If not, a dialog form is shown from there:
'// in load event...

If dv.Count = 0 Then
            If MessageBox.Show("No data") = Windows.Forms.DialogResult.Yes Then
                Dim frm As New DialogForm
                If frm.ShowDialog = Windows.Forms.DialogResult.Cancel Then
                          Me.Close()              '---->>> HERE EXCEPTION
                Else
                    '// Scroll to last row
                    bs.MoveLast()
                End If
            Else
                Me.Close()            '-----> HERE EXCEPTION
            End If
 End If

The exception i get when i cancel that dialog form says:
"Value Close() cannot be called while doing the CreateHandle()"

Any ideas on this??????

Just a note, if  i dont open the the child form from the other child, its fine.

dim frm as new OtherChildForm
frm.MdiParent = Me.MdiParent      '---> IF I REMOVE THIS LINE, DONT GET THE EXCEPTION !
frm.Show()