By default, the PenLink property is exPenDot. Use the PenLink property to define the type of the pen used to paint the links between nodes. Use the PenLinkAssistant property to define the type of the pen used to paint the links between assistant nodes. Use the LinkColor property to hide the links between nodes. Use the PenWidthLink property to specify the thickness of the links between nodes. For instance, the LinkColor property has the same value as BackColor property, the control doesn't paint the links between the nodes. Use the PenBorderNode property to specify the pent used to paint the borders of the node.