ComboBox in Flex

I have a combobox with multi selection. when i click on add button, which ever data is selected in the Combobox, those data has to be displayed in the an开发者_如何学Cother comboBox.

Please check the code and Can anyone of you please help me on this.

<mx:HBox>
 <mx:Label width="140" text="{resourceManager.getString   ('resources', 'settings_configuration_database_select_object_instance')}"/>
     <mx:List id="obj_instance" enabled="true" allowMultipleSelection="true" width="164" height="70"/>      
     <mx:Spacer width="20"/>
     <mx:Button label=">>"/>
     <mx:List id="selected_instance" enabled="true" allowMultipleSelection="true" width="164" height="70"/>
</mx:HBox>      

Thanks, Ravi

What about:

<ov:HPButton label=">>">
    <ov:click><![CDATA[
        for each (var item:* in obj_instance.selectedItems)
            selected_instance.dataProvider.addItem(item);
    ]]></ov:click>
</ov:HPButton>

Of course, you'll have to make sure that the dataProvider of instance is something reasonable (like an ArrayCollection)…