border - shannah/CodeRAD GitHub Wiki
A Container that uses BorderLayout as its layout manager.  An alias for <container layout="new BorderLayout()">.
<border>
    <button layout-constraint="north">North button</button>
    <button layout-constraint="south">South button</button>
    <button layout-constraint="east">East button</button>
    <button layout-constraint="west">West button</button>
    <button layout-constraint="center">Center Button</button>
</border>| 
 Note 
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All child components of a <border> tag must include the layout-constraint attribute with a value of north, south, _east, west, or center.  If the layout-constraint value is prefixed with java:, then you can also provide a Java expression whose result will be used as the constraint.
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The following example includes two <border> tags.  One as the root view of the form, and the other embedded inside the center of the root.  The embedded <border> tag demonstrates the use of the java: prefix for the layout-constraint parameter that will allow you to specify the layout-constraint using a Java expression, rather than a literal.
<?xml version="1.0"?>
<border safeArea="true" xsi:noNamespaceSchemaLocation="BorderLayoutSample.xsd" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
    <title>BorderLayout Sample</title>
    <button layout-constraint="north">North button</button>
    <button layout-constraint="south">South button</button>
    <button layout-constraint="east">East button</button>
    <button layout-constraint="west">West button</button>
    <border layout-constraint="center">
        <button layout-constraint="java:BorderLayout.NORTH">Center < North</button>
        <button layout-constraint="java:BorderLayout.SOUTH">Center < South</button>
    </border>
</border>