Bindable variable and WebServices

Question

Hi,
  I am new to flex and am trying to create a simple interactive application which interacts with a Web service.
I am using a button to trigger the web service call and want to display the data in a data grid component. I also have a Combo box which i am populating with the first column of the same web service's result set.
The problem I am facing is that both the components seem to have a lag of one click. Which means, when i click the Get Data button to trigger the web service call the first time, the web service returns data (verified by the web service logs) but it is not displayed on the data grid. The next time i click on the Get Data button, the data is displayed.
I have pasted the code below. Please let me know where i have gone wrong in it.
<?xml version="1.0" encoding="utf-8"?>
<mx:Application xmlns:mx="http://www.adobe.com/2006/mxml"
backgroundGradientColors="[0xFFFFFF,0xAAAAAA]"
horizontalAlign="left"
verticalGap="15" horizontalGap="15" >
<mx:WebService id="dataFetching"
wsdl="http://localhost:8080/SRS/services/KeyDriversChainDataService?wsdl"
fault="mx.controls.Alert.show(event.fault.faultString)"
>
     <mx:operation name="getMRSMarkets">
        <mx:request>
              <viewType>DSB</viewType>
             <category>HOTS</category>
             <segment>ALL</segment>
             <tradingCo>ALL</tradingCo>
             <brand>ALL</brand>
             <timeframe>Weekly-TABLE</timeframe>
             <analyticType>SUMMARY</analyticType>
             <market>Total Coverage</market>
             </mx:request>
    </mx:operation>
</mx:WebService>
<mx:Script>
     <![CDATA[
              import mx.collections.ArrayCollection;
              import mx.rpc.events.ResultEvent;
              import mx.rpc.events.FaultEvent;
              [Bindable]
              public var distinctMrkt:ArrayCollection;
          private function getMarkets(): void{
               dataFetching.getMRSMarkets.send();
               distinctMrkt = dataFetching.getMRSMarkets.lastResult as ArrayCollection;
               table.dataProvider = distinctMrkt;
          private function showGraph(market:String):void{
               selected.text=market;
]]>
</mx:Script>   
<mx:Button id="datafetch" label="Get Data" click="getMarkets()"/>
<mx:DataGrid id="table" width="100%" >
     <mx:columns>
          <mx:DataGridColumn dataField="a1_market" headerText="Market"/>
          <mx:DataGridColumn dataField="a2_analytic_type" headerText="Analytic Type"/>
     </mx:columns>
</mx:DataGrid>
<mx:ComboBox id="dropdown" dataProvider="{distinctMrkt}" labelField="a1_market"
click="showGraph(dropdown.selectedLabel)"/>
<mx:HBox>
          <mx:Label text="Selected item is: "/>
          <mx:Label id="selected" />
</mx:HBox>
</mx:Application>

Answer 1

Hi Abdellatif,
Ok, that would clarify things.
You have an idea if this is documented somewhere?
Reason we ask:the "xi3-1_designer_en" guide, the specification for the @variable function states:
"BusinessObjects system variables. ...
Report variables. ...
Operating system variables. You can enter Windows environment variables in order to obtain information about your installation.
Custom variables. With Desktop Intelligence, you can use a predefined text file to provide a list of fixed variable values."
There's no explicit referal to DeskI only for OS system variables, like there is for custom variables.
Thanks!
Raf