Alignment of FocusPanel with PCT?

Hi,

I want to create some inner FocusPanels, and align them in percent (PCT).
But I can even not align just 2 Panels to a PCT size:

<g:DockLayoutPanel unit='EM'>
    <g:north size='20'>
    <g:HorizontalPanel>
        <g:FocusPanel width='90%'><g:Label>Left</g:Label></g:FocusPanel>
        <g:FocusPanel><g:Label>Right</g:Label></g:FocusPanel>
    </g:HorizontalPanel>
    </g:north>
</g:DockLayoutPanel>

Result: Both labels are align to the left one ofter another. Why is the 1st panel not taking 90% of the screen?

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