By default, the tree adapter considers an object to be a tree leaf when the method IlpDataSource.getContainerInterface returns null for that object.
You can have a finer control over whether an object should be considered as a tree leaf or not by means of the property expansion. By default, this property is set to the value ExpansionType.IN_PLACE, which produces the default behavior described earlier. To have an object considered as a leaf, even if the method getContainerInterface does not return null, you must set this property to ExpansionType.NO_EXPANSION. For information on how to set a property value, see section Introducing Cascading Style Sheets in the Styling documentation.
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