ReDraw the line, not the whole chart

I'm trying to draw the new data coming in every 5 seconds, but I want it to be a smooth transition when reDrawing.
So, I was thinking it would be handy if the Draw() method have an overload where draws just a line, since it already have setLineSpeed() to render the line, so the new set of data can be drawn on the chart without redrawing the whole graph.
Is that possible, and if it is how? If not, would a future version have that option?