Flex: Number input with buttons -

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i'm trying use buttons text input, far can make input 1 number. (if click button second input, erases first input.) there way fix this?

i added code here , image show i'm trying make.

i'd appreciate help!

<mx:button x="18" y="116" label="1" width="20" height="20" fontsize="7" click="one(event)"/> <mx:button x="37" y="116" label="2" width="20" height="20" fontsize="7" click="two(event)"/> <mx:button x="56" y="116" label="3" width="20" height="20" fontsize="7" click="three(event)"/> <mx:button x="18" y="135" label="4" width="20" height="20" fontsize="7" click="four(event)"/> <mx:button x="37" y="135" label="5" width="20" height="20" fontsize="7" click="five(event)"/> <mx:button x="56" y="135" label="6" width="20" height="20" fontsize="7" click="six(event)"/> <mx:button x="18" y="154" label="7" width="20" height="20" fontsize="7" click="seven(event)"/> <mx:button x="37" y="154" label="8" width="20" height="20" fontsize="7" click="eight(event)"/> <mx:button x="56" y="154" label="9" width="20" height="20" fontsize="7" click="nine(event)"/> <mx:button x="18" y="173" label="x" width="20" height="20" fontsize="7" click="erase(event)"/> <mx:button x="37" y="173" label="0" width="20" height="20" fontsize="7" click="zero(event)"/> <mx:button x="56" y="173" width="20" height="20" label="ent" fontsize="7" click="ent(event)"/>  public function one(event:mouseevent):void {         numbercopies.text = "1";     }     public function two(event:mouseevent):void {         numbercopies.text = "2";     }

...

image

<?xml version="1.0" encoding="utf-8"?> <s:application xmlns:fx="http://ns.adobe.com/mxml/2009"                 xmlns:s="library://ns.adobe.com/flex/spark"                 xmlns:mx="library://ns.adobe.com/flex/mx" >      <fx:script>         <![cdata[              [bindable] public var copies:string = "";              public function one(event:mouseevent):void {                 copies += "1";             }             public function two(event:mouseevent):void {                 copies += "2";             }          ]]>     </fx:script>     <s:label id="numbercopies" text="{copies}"/>     <mx:button x="18" y="116" label="1" width="20" height="20" fontsize="7" click="one(event)"/>     <mx:button x="37" y="116" label="2" width="20" height="20" fontsize="7" click="two(event)"/>   </s:application>

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