How to override a create function?

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Merx
 #1
Hi Gents I'm getting Null pointer exceptions when attempting to override a parents Create method e.g.

Type testA
	Field x:Int
	Field y:Float
	Function Create:testA(newx:Int)
		newA:testA = New testA
		newA.x = newX
		Return newA
	End Function
End Type

Type testB Extends testA
	Function Create:testB(newx:Int)
		Return testB(Super.Create(newx))
	End Function
End Type
'Test Harness

Graphics 640, 480, 0

Global test:testB
test = testB.Create(10)
test.y = 5

While Not KeyHit(KEY_ESCAPE)
	Cls
	Flip
	FlushMem
Wend

This generates an unhandled exception on this line : 
test.y = 5
What I'm trying to do is ensure the old version of create is called by default in the new version so I can then add additional elements. Unfortunatly I'm doing something fundamentally wrong?!

Can you help?

Regards

Merx