Protected Overrides Function ProcessCmdKey(ByRef msg As _
  System.Windows.Forms.Message, ByVal keyData As System.Windows.Forms.Keys) As _
  Boolean
        If Not EigeneBedingung Then
            Return True ' Key wird nicht zur Behandlung weitergeleitet
        Else
            Return MyBase.ProcessCmdKey(msg, keyData)
        End If
End Function