Okay, I see. So, what you need to do is have an outer piece that wraps
both your menu and your dockable window within itself, and make that the
only window inside your display. Something like this:
window.bxml:
<Window xmlns:bxml=...
<TablePane styles=...>
<columns>
<TablePane.Column
width="1*"/>
</columns>
<rows>
<TablePane.Row
height="-1">
<bxml:include src="menu_bar.bxml" inline="true"/>
</TablePane.Row>
<TablePane.Row
height="1*">
<bxml:include src="dockable/dockingWindow.bxml" inline="true"/>
</TablePane.Row>
</rows>
</TablePane>
</Window>
Then in your startup method, just load this "window.bxml" as the only
one and open it.
HTH,
~Roger Whitcomb