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XamDockManager with only one content pane

I have a application with a xamDockManager and in it I've put a single ContentPane. That ContentPane is rendered correclty, but the close button is disabled, even if I set AllowClose="true" manually. This is my xaml code for this 





igDock:XamDockManager x:Name="startupManager"




VerticalAlignment="Stretch" Grid.Row="1"










<igDock:ContentPane Header="Welcome" AllowClose="True">










<TextBlock HorizontalAlignment="Center" VerticalAlignment="Center" FontSize="24" FontWeight="Bold" Foreground="Red">WELCOME USER</TextBlock>







Can anyone explain this? Is invalid to put a ContentPane directly on a xamDocManager?