property Node.ShowRoundLink as Boolean
Specifies whether the round links are shown between parent and child nodes.

TypeDescription
Boolean A Boolean expression that specifies whether links between the node and its child nodes are shown rounded or rectangular. 
By default, the ShowRoundLink property is False. Use the ShowRoundLink property to specify round links for a specified node and its child nodes. Use the ShowRoundLink property to specify round links for all nodes. Use the PenLink property indicates the type of the pen used to paint the links between nodes. Use the PenWidthLink property to specify the thickness of the links between nodes. Use the LinkColor property to specify the color for the links between nodes.

The following screen shot shows the chart using round links ONLY for root node ( Root.ShowRoundLink property is True ) :