Another workaround is to call tree1.validateNow() before setting the selectedIndex as adviced here in workaround notes:
https://bugs.adobe.com/jira/browse/SDK-11424 Workaround (if any): Call List.validateNow() after changing the data provider but before setting the selected index. 2008/4/25 Andriy Panas <[EMAIL PROTECTED]>: > Hi Flexcoders, > > I am on Flex 2.0.1 SDK. > > My use case is as follows: > > 1) At the start of the application, I set dataproviders of > XMLListCollection type to 2 different UI controls on stage (<mx:Tree> > and <mx:List>) and then I set immediately selectedIndexes to 0. > > It works all right for both controls. > > 2) Then I switch dataproviders at the runtime for both UI controls by > pressing the button and then I set immediately selectedIndexes to 0 > again. > > <mx:List> displays the selection correctly, while <mx:Tree> does not. > > My current workaround is to set myTree.selectedIndex = 0 within > "callLater" call or within FlexEvent.UPDATE_COMPLETE event listener > for mx:Tree. > > > My test file is quite simple: > ------------------- > <mx:Application > xmlns:mx="http://www.adobe.com/2006/mxml"; > initialize="onInitialize()"> > <mx:Script> > <![CDATA[ > > private function onInitialize() : void { > tree1.dataProvider = capitals; > list2.dataProvider = capitalColl; > setSelectedIndexes(); > } > > private function changeDP() : void { > tree1.dataProvider = capitals2; > list2.dataProvider = capitalCol2; > > setSelectedIndexes(); > //callLater(setSelectedIndexes) > } > > private function setSelectedIndexes() : void { > tree1.selectedIndex = 0; > list2.selectedIndex = 0; > } > ]]> > </mx:Script> > <mx:XML id="capitals"> > <root> > <Capitals label="U.S. State Capitals"> > </Capitals> > <Capitals label="Canadian Province Capitals"> > </Capitals> > </root> > </mx:XML> > > <mx:XML id="capitals2"> > <root> > <Capitals label="U.S. State Capitals-2"> > </Capitals> > <Capitals label="Canadian Province Capitals-2"> > </Capitals> > </root> > </mx:XML> > <!-- Create an XMLListCollection representing the Tree nodes. > capitals.Capitals is an XMLList with both Capitals elements. --> > <mx:XMLListCollection id="capitalColl" source="{capitals.Capitals}"/> > <mx:XMLListCollection id="capitalCol2" source="{capitals2.Capitals}"/> > <mx:Tree id="tree1" > labelField="@label" > showRoot="false" > width="300"/> > <!-- The XMLListCollection does not include the XML root. --> > <mx:List id="list2" > labelField="@label" > width="300"/> > > <mx:Button id="btn1" label="Change data provider" click="changeDP()"> > > </mx:Button> > </mx:Application> > ------------------- > > -- > Med venlig hilsen / Best regards > Andriy Panas > [EMAIL PROTECTED] > -- -- Med venlig hilsen / Best regards Andriy Panas [EMAIL PROTECTED]
