Pivot/model open/close door?

Maybe it is something else? Since I tried this:

Graphics3D 800, 600, 0, 2
SetBuffer BackBuffer()

cam = CreateCamera()
MoveEntity cam, 0, 0, -15

hatchclosed=CreateCube()
hatchopen=CreateCone()

EntityAlpha hatchclosed,1
EntityAlpha hatchopen,0

While Not KeyHit(1) 

If KeyHit(35) Then
	which_one=which_one+1
	Select (which_one Mod 2)
		Case 0
			EntityAlpha hatchclosed,1
			EntityAlpha hatchopen,0
		Case 1
			EntityAlpha hatchopen,1
			EntityAlpha hatchclosed,0
	End Select
EndIf

RenderWorld()
Flip

Wend

End

and it seems to work okay.