CreateMirror() problem?

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MeowZ

I think there is weird thing about CreateMirror().
An object which is under mirror plane also appear above the mirror. Anyone can help? Here is the code:

Graphics3D 800,600,32,2
SetBuffer BackBuffer()

;Lights
light01=CreateLight()
PositionEntity light01,15,20,15

;Plane
plane=CreatePlane()
EntityColor plane, 0, 30, 255
EntityAlpha plane, 0.8

;Mirror
mirror = CreateMirror();

;Camera
cam=CreateCamera()
PositionEntity cam,0,5,-15
RotateEntity cam,10,0,0

;Cube
cube=CreateCube()
ScaleEntity cube,2,2,2

cube2 = CreateCube() ; no PhysX object
PositionEntity cube2, -10, 3, 0
EntityColor cube2, 255, 0, 0

cube3 = CreateCube() ; no PhysX object
PositionEntity cube3, 10, -3, 0
EntityColor cube3, 255, 0, 0

sp = CreateSphere ()
EntityColor sp, 255, 0, 0

Repeat ;Main Loop

If (KeyDown(31)) ShowEntity mirror ; press S to show mirror
If (KeyDown(35)) HideEntity mirror ; press H to hide mirror

time=MilliSecs ()

UpdateWorld()
RenderWorld()

Text(0, 0,"press S to show mirror")
Text(0,20,"press H to hide mirror")

Flip

Until KeyHit(1)

End