Gordon, thank you for this answer. Are there any alternatives? I have one component inside another with the same properties. Actually, the second one is the pop up and the first one is a kind of "decorator". Together they work the way similar to ComboBox (ComboBox itself and List respectively also have similar properties). According to the example provided, I need to make two variables (flag and cache) for each property in both classes. It seems a bit overweighted for me.

On 9/29/06, Gordon Smith <[EMAIL PROTECTED]> wrote:

Yes, you should be using invalidation. The typical pattern for doing this is as follows:

      private var _buttonLabel:String = "";

      private var buttonLabelChanged:Boolean = false;


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