Custom node control

// custom node control class.
class MyNodeControl : BindableControl
{
  public MyNodeControl()
  {
    // bind to the Color node class`s property.
    DataFieldName = "Color";
  }
 
  protected override Size MeasureSize(Node pNode, DrawContext pContext)
  {
    // static node control size.
    return new Size(15, 15);
  }
 
  protected override void Draw(Node pNode, DrawContext pContext)
  {
    // display bounded color.
    Color cl = GetValue<Color>(pNode);
    using (SolidBrush br = new SolidBrush(cl))
    {
      pContext.Graphics.FillRectangle(br, pContext.Bounds);
    }
  }
 
  protected override void MouseDown(MouseActionArgs pArgs, DrawContext pContext)
  {
    // switch color on mouse click.
    Color cl = GetValue<Color>(pArgs.Node);
    Color clNew = (cl == Color.Red) ? Color.Blue : Color.Red;
    SetValue(pArgs.Node, clNew);
    OnControlChanged(eNodeControlChangeType.Look);
    }
}
 
// use our node control.
MyNodeControl nc = new MyNodeControl();
nc.AttachTo(tree);
 
NodeWithColor node = new NodeWithColor();
// initialize bounded property value.
node.Color = Color.Red;
node.AttachTo(tree);