Updating Geom_BSplineSurface on video

Hello,

I have a valid Geom_BSplineSurface object which has already been displayed correctly on the screen by the mean of an AIS_Shape object.

BRepBuilderAPI_MakeFace myFace;
BRep_Builder myBuild;

TopoDS_Compound compound;
myBuild.MakeCompound( compound);

myFace.Init(srf);

myBuild.Add(compound, myFace);

this->BSShape = new AIS_Shape(compound);
myAISContext->Display(BSShape);

I've made some code to select a control point and modify its weight
by using Geom_BSplineSurface::SetWeight(UIndex,VIndex,Weight)

Everything works well in memory: the point weight is updated.

Now how am I expected to update the visual content?

I've tried by using the same code as above again, with no results.

Thanks in advance.