How to fire event with parameter?

Hi folks,
does anyone know how to use the event parameter functionality?
My idea is to fire an event within the richisland and pass a parameter value. As I recognized the function
var myParameter:Number = new Number();
FlashIsland.fireEvent(this,"myEvent",myParameter);
On WD side in ROOTUIELEMENTCONTAINER I created a child element of type GACEvent, named myEvent. This event has a GACEventParameter named myParameter.
But running the app I am getting a dump:
WebDynpro Exception: ERROR: GAC_EVENT_PARAMETER 'myParameter' missing (GAC_EVENT='myEvent')
Any idea of how to fix this?

Hi,
I solved it now. The correct syntax is:
FlashIsland.fireEvent(this, 'myEvent', {myParameter:myValue});
Hope it helps you too.
Greets

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