To insert alternate content in a frameBorderLayout:
Alternatively, you can drag and drop a component from the Component Palette to the alternateContent node.
...
<document>
<contents>
<frameBorderLayout>
<alternateContent>
</alternateContent>
<center>
<frame source="frame_center.uix" name="fcenter"/>
</center>
<left>
<frame source="frame_left.uix" name="fleft" width="30%" />
</left>
</frameBorderLayout>
</contents>
</document>
...
About FrameBorderLayout and its Named Children
Inserting a Frame in a Named Area
Using FrameBorderLayout
Working with Layout Components
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