property Node.IsGroup as Boolean
Retrieves a value that specifies whether the node belongs to a group.

TypeDescription
Boolean A Boolean expression that specifies whether the node is added using the AddGroup method or not. 
Use the IsGroup property to specify whether a node was added using the AddGroup method. Use the CountGroup and Group properties to access or enumerate the group nodes collection. Use the AddGroup method to add new nodes in the same group ( multiple parents ). Use the InflateGroupY property to specify the indentation of the group on vertical axis.