By default, the PenLinkAssistant property is exPenDot. Use the PenLinkAssistant property to define the type of the pen used to paint the links between assistant nodes. Use the AddAssistant property to add an assistant node. The LinkAssistantColor property specifies the color of the links between assistant nodes. Use the PenWidthLinkAssistant property to specify the thickness of the links between assistant nodes. For instance, the LinkAssistantColor property has the same value as BackColor property, the control doesn't paint the links between assistant nodes. Use the PenLink property to define the type of the pen used to paint the links between nodes.