spark list- bindable setter not working?

hello,

i have xml node bound custom variable in custom list component itemrenderer (called shelveslist) so:

 

          [bindable]
            public function set selectedid(id:number):void{
               var i:number = 0;
                each (var item:* in dataprovider){
                    if(item.@id == id){
                        selectedindex = i;
                    }
                i++;}
            }
           
            public function selectedid():*{
                return selecteditem.@id;
            }

 

 

and in app have this:

 

<components:shelveslist id="shelves" selectedid="@{bookmodel.book.shelf_id}"/>

 

where bookmodel xml object.

 

what strange when change bookmodel.book.shelf_id not update shelves.selectedid. if remove [bindable] setter update bookmodel.book.shelf_id.

 

however, if [bindable] removed setter , change selectedid, not update bookmodel.book.shelf_id, though have two-way binding set.

 

is bug or overlooking obvious? thank help.

nevermind, figured out! need set [bindable] on getter, , add en event handler on change:

 

[bindable("selectedidchanged")]
public function selectedid():*{
                return selecteditem.@id;
            }
           
            public function set selectedid(id:number):void{
                var i:number = 0;
                each (var item:* in dataprovider){
                    if(item.@id == id){
                        selectedindex = i;
                    }
                i++;}
            }
           
            protected function setselectedid(event):void{
                selectedid = number(selecteditem.@id);
                dispatchevent(new event("selectedidchanged"));
            }

 

then on change event, use setselectedid. -b

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