Hi,

Colors of shape's filled decorations can be set only through the Shape class, and you can specify that all BpmnEndTerminate nodes should be yellow like this:

var yellow = new SolidBrush(Color.Yellow);

var innerCircle = Shapes.BpmnEndTerminate.ShapeDecorations[0];
innerCircle.Brush = yellow;
innerCircle.Pen = new Pen(yellow);

var outerCircle = Shapes.BpmnEndTerminate.ShapeDecorations[1];
outerCircle.Brush = yellow;
outerCircle.Pen = new Pen(yellow); 

At this time it's not possible to set these colors to different values for different nodes, unless you clone the shape for each node (or for each color if using only a few colors, e.g. create YellowBpmnEnd, RedBpmnEnd, etc. shapes). You can also implement that using custom drawing, setting the specific colors as above from DrawNode event handler, and calling the Shape.Draw method.

I hope that helps,
Stoyan