Flex 3 - Issue with selecting an item in the list as default

how select item in list default

default selected item of index 0

i tried stuff --

listid.selectedindex = somevalueinmyprogram - 1; // 0

but when debug get
_selectedindex = 0 selectedindex = -1

and default value not selected why so? [i have checked obvious somevaluefrommyprogram not equal 0]

help!

try this

 

<mx:script>           <![cdata[                import mx.collections.arraycollection;                [bindable]                public var expenses:arraycollection = new arraycollection([                     {month:"jan", profit:2000, expenses:120, amount:45},                     {month:"feb", profit:1000, expenses:200, amount:60},                     {month:"mar", profit:1500, expenses:500, amount:30}                     ]);            ]]>      </mx:script>       <mx:list dataprovider="{expenses}" labelfield="month" id="mylist" creationcomplete="mylist.selectedindex=2;" /> 

probably moment when try set selectedindex isn't right one.

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