The rows occupy 80% and 20% of the Canvas container's height from top to bottom, respectively.

           

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<!-- constraints\BasicRowColumn.mxml -->
<s:Application xmlns:fx="http://ns.adobe.com/mxml/2009"
    xmlns:mx="library://ns.adobe.com/flex/mx"
    xmlns:s="library://ns.adobe.com/flex/spark">
    <s:layout>
        <s:VerticalLayout />
    </s:layout>
    <mx:Canvas>
        <mx:constraintColumns>
            <mx:ConstraintColumn id="col1" width="212" />
            <mx:ConstraintColumn id="col2" width="100%" />
        </mx:constraintColumns>
        <mx:constraintRows>
            <mx:ConstraintRow id="row1" height="80%" />
            <mx:ConstraintRow id="row2" height="20%" />
        </mx:constraintRows>
        <!-- Position child components based on 
            the constraint columns and rows. -->
    </mx:Canvas>
</s:Application>

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The rows occupy 80% and 20% of the Canvas container's height from top to bottom, respectively. : Layout « Container « Flex

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