Depending on how you are calling that code, you may need to add a try catch block around it. I originally had my app loading XML data during the initialize process. It then fed that data directly into a tree. Since the tree had data right away, that line of code worked fine.
I've recently changed things a bit so that the app loads with no XML data loaded. I was also getting the same eror you were until I put a try catch block around it. The auto expand code was getting called, but since there was no data in my tree, the try catch prevented any errors. You can also use: assemblyTree.expandChildrenOf(assemblyTree.selectedItem, true); to expand a specific node in the tree. Wayne --- In flexcoders@yahoogroups.com, "Sascha" <[EMAIL PROTECTED]> wrote: > > I know this had been brought up before and I found some stuff on it in the > archive but it doesn't work for me... I want to auto-expand a Tree when it > is displayed ... > > objectTree.expandChildrenOf(objectTree.dataProvider[0], true); > > gives me a "Cannot access a property or method of a null object reference." > > myTree.selectedItem = myTree.dataProvider.getItemAt(0); //Mailbox node > myTree.expandChildrenOf(myTree.selectedItem, true); > > also doesn't work. > > objectTree.selectedIndex = 0; > objectTree.expandChildrenOf(objectTree.selectedItem, true); > > Selects the first item but doesn't expand it. > > What can I do to expand the tree? Any info on this would be appreciated! > > Sascha > -- Flexcoders Mailing List FAQ: http://groups.yahoo.com/group/flexcoders/files/flexcodersFAQ.txt Search Archives: http://www.mail-archive.com/flexcoders%40yahoogroups.com Yahoo! Groups Links <*> To visit your group on the web, go to: http://groups.yahoo.com/group/flexcoders/ <*> Your email settings: Individual Email | Traditional <*> To change settings online go to: http://groups.yahoo.com/group/flexcoders/join (Yahoo! ID required) <*> To change settings via email: mailto:[EMAIL PROTECTED] mailto:[EMAIL PROTECTED] <*> To unsubscribe from this group, send an email to: [EMAIL PROTECTED] <*> Your use of Yahoo! Groups is subject to: http://docs.yahoo.com/info/terms/
