TabNavigator tab selection event

I've been trying to trigger an event when i click on the tab in a tabnavigator.
The problem is that if i try to use the "change" event, the events for components inside the tab navigator are being fired and thats causing me problems. Could you suggest an alternative to "change" with a specific event that would enable me to fire a specific function only when i click on the tabs?
I know the question is trivial but I couldnt find an answer anywhere.
Thanks in advance

<s:VGroup>
          <!-- Create a Spark ButtonBar control to navigate
          the ViewStack container. -->
          <s:TabBar id="tabBar" dataProvider="{myViewStack}" change="tabbar1_changeHandler(event)"/>
          <!-- Define the ViewStack and the three child containers. -->
          <mx:ViewStack id="myViewStack"
                           borderStyle="solid"
                           width="100%">
               <s:NavigatorContent id="search" label="Search">
                    <s:Label text="Search Screen"/>
               </s:NavigatorContent>
               <s:NavigatorContent id="custInfo" label="Customer Info">
                    <s:Label text="Customer Info"/>
               </s:NavigatorContent>
               <s:NavigatorContent id="accountInfo" label="Account Info">
                    <s:Label text="Account Info"/>
               </s:NavigatorContent>
          </mx:ViewStack>
     </s:VGroup>
protected function tabbar1_changeHandler(event:IndexChangeEvent):void
     Alert.show(tabBar.selectedIndex.toString());

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