Bindable functions

Hi
well I have never manage to get Bindable functions to work, but now i may need then

I have a view stack, with a renderer, in the rendered i would to disable elements of the render dependent on the view stack, i could hold a bit off Bindable data (thats what i do in other place), if i could create a Bindable function i could call this function in the render and disable elements as needed

unfortunately i can not get this approach to work

[Bindable]

public function get last():Boolean

return this.viewIndex === (this.numElements - 1);

<common:ViewStack id="block" dataProvider="{blocks}"

verticalCenter="0" horizontalCenter="0"

itemRenderer="com.peach.uofs.lesson.ReadingBlockRenderer"

viewChange="setHLClip(event)">

</common:ViewStack>

i want to be able to dibble a button in ReadingBlockRenderer

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