Memory leak?

I ran some codes below twice, and closed the document(not application), then I found some memory isn't released. Codes are as follows:

myAISContext->RemoveAll();

gp_Pnt origin;
origin.SetX(rand() % 1000);
origin.SetY(rand() % 1000);
origin.SetZ(rand() % 100);

for (int i = 0; i {
for (int j = 0; j {
Standard_Real x = origin.X() + i * 2;
Standard_Real y = origin.Y() + j * 2;
Standard_Real z = origin.Z();

BRepPrimAPI_MakeBox B(gp_Pnt(x, y,z), 2, 2, 1);
Handle(AIS_Shape) aisShape = new AIS_Shape(B.Shape());
myAISContext->Display(aisShape, Standard_False);
}
}
myAISContext->UpdateCurrentViewer();
Fit();

"myAISContext->RemoveAll()" does not free the memory?

Thanks.