Custom Validator for a Custom Component

Question

I am having troubling passing values from my custom component
to my custom validator (via a model). For some reason when the
validate() function is called for the validator the value parameter
passed to the validator is not showing the value from my custom
component.
I have attached some example code to illustrate.
Here is my model:
<mx:Model id="myModel">
<root>
<mod>
<name>{myTextInput.text}</name>
<date>{myDateField.selectedDate.getTime()}</date>
<length>{myComp.getLength()}</length>
</mod>
</root>
</mx:Model>
When I update the value of myTextInput or myDateField the
model (as sent to the validator) shows the correct value. When I
change the value of myComp the change is not reflected.
Is there a particular event (or something) being dispatched
in the other components to cause the model to get the new value
that I need to include in my custom component? I am pretty stuck
and would appreciate any help.
Many thanks

Answer 1

Does myComp extend EventDispatcher (or any class which does)?
You need to flag the getLength() function as bindable and to
dispatch an event:
[Bindable('getLengthChange")]
public function getLength() : Number
// does whatever it does
When you update myComp have it dispatchEvent( new
Event("getLengthChange") ) and I think it will work.