Use percentage to control the width

           

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<!-- components\HBoxSizePercentSpark.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" width="600">
    <s:layout>
        <s:VerticalLayout />
    </s:layout>
    <s:SkinnableContainer id="hb1" width="75%">
        <s:layout>
            <s:HorizontalLayout />
        </s:layout>
        <s:Button id="b1" label="Label 1" width="25%" />
        <s:Button id="b2" label="Label 2" width="75%" minWidth="80" />
        <s:Button id="b3" label="Label 3" />
    </s:SkinnableContainer>
    <mx:Form>
        <mx:FormItem label="SkinnableContainer:">
            <mx:Label text="{hb1.width}" />
        </mx:FormItem>
        <mx:FormItem label="Button #1:">
            <mx:Label text="{b1.width}" />
        </mx:FormItem>
        <mx:FormItem label="Button #2:">
            <mx:Label text="{b2.width}" />
        </mx:FormItem>
        <mx:FormItem label="Button #3:">
            <mx:Label text="{b3.width}" />
        </mx:FormItem>
    </mx:Form>
</s:Application>

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Use percentage to control the width : Spark component « Components « Flex

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