Logic AND, Less Than in mxml

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i've been looking equivalent < , && in mxml have value bound bindable variable , checking in button visibility if value greater particular value. greater operator > works, or operator || works less , and not. ? thanks.

ps : in mxml not in actionscript cdata block.

since it's in xml, need escape them: < use &lt; , && use &amp;&amp;

e.g. show button if x<0 , y<0:

<mx:button visible="{x &lt; 0 &amp;&amp; y &lt; 0}" />


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