TDiagramLine color during inserting/mouse drawing


I can nicely manipulate the color (and style, thickness etc.) of TDiagramLine after it has been drawn in a diagram (in child classes).
However, I wonder how to change the line properties while drawing: I can change thickness, but changing the color does not reflect in the mouse-drawing operation.
Also overriding TDiagramLine DrawLine, InitDrawer, UpdateDrawing (to set TLineInfo or Dgr)Canvas Pen.Color) does not help: the line color during mouse-drawing stays black.

How to do this?

Thanks, regards, Wilfried

If you mean the line appearance while it's still being inserted (dragged) in diagram, indeed that is not possible, the look and feel (thin, dotted) is fixed.