hello, with the following code can I realize the effect of the picture I sent.My question is, wenn I click on Node(T002), the Color of the Node(T002) will be red, but which nodes I clicked before(V005,V004) is still  remain red. What I want is, wenn I click a Node, it's color will be red, and meanwhile the other clicked nodes' color will return to be it's original color . In other word, always there is only one red node.
Could you tell how can I fix this problem? thank you indeed.

diagram2.addDiagramListener(new DiagramAdapter() {
        public void nodeClicked(NodeEvent e)
        {   
            
              Pen dashedPen2 = new Pen(0.8f, Color.RED,DashStyle.Solid);
              e.getNode().setPen(dashedPen2);
              Toast.makeText(getApplicationContext(), e.getNode().getId().toString(), Toast.LENGTH_SHORT).show();
        }
      });

very very very helpful!!!