Memory leaks in the "Redisplay" function of AIS_InteractiveContext

I try the OCC6.5.2,I find a memory leaks in "Redisplay" function of AIS_InteractiveContext.
And I have set the MMGT_OPT = 0 ,After loop "Redisplay" and "RemoveAll",the memory yet increase.
The code like these:

Handle_AIS_Shape myBox;
BRepPrimAPI_MakeBox B(gp_Pnt(0,-400,-100), 200.,150.,100.);
myBox = new AIS_Shape(B.Shape());
myAISContext->SetMaterial(myBox,Graphic3d_NOM_PEWTER);
myAISContext->SetDisplayMode(myBox,1);
myAISContext->Display(myBox);

for(int i = 0; i

{

BRepPrimAPI_MakeBox B(gp_Pnt(0-i,-400-i,-100-i), 200.+i,150.+i,100.+i);

myBox->Set(B.Shape());
myAISContext->Redisplay(myBox);

}

myAISContext->RemoveAll();

anyone can fix it?

Thanks!