Android Question how to generate event

HI guys,
I'm new here and I'm wondering how to generate an event.
I Use ABZxing and I'm able to call the ABGetBarcode sub, That part is ok
but my program never hit the sub I created called myscanner_BarecodeFound(barCode as string,formatName as string) as the ABBarcodeTest exemple does.

I was wondering if it was because i wrote it manually, and if so , How can I generate this event.

I'm normally working In visual Studio.

Thanks for you help