Réponse acceptée !
voici comment j'ai resolu mon pb
Private Sub frmLstClient_Activated(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Activated
If Not Me.MdiParent Is Nothing Then
Me.WindowState = FormWindowState.Maximized
Else
Me.WindowState = FormWindowState.Normal
End If
End Sub
merci pour les idees de jmfmarques
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