Context Menu [Resolved]

I would like to know if this is possibe and maybe get an example of how to do it.

Code:

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Private Sub Form1_Mousedown(ByVal sender As System.Object, ByVal e As _
    System.Windows.Forms.MouseEventArgs) Handles MyBase.MouseDown

        If Panel1.Visible = True Then
          'Do something here to disable context menu from showing up
        End If
End Sub

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This disable showing the menu attached to TextBox1 when if it's visible .

VB Code:

If Me.TextBox1.Visible Then Me.TextBox1.ContextMenu = Nothing