The tree consists of group and leaf nodes. Group nodes can, in turn have additional nodes (composite pattern). Accordingly, for both the node types, the interfaces TreeGroupDataModel and TreeNodeDataModel are available (TreeGroupDataModel extendsTreeNodeDatamodel). With their help, the tree structure can be easily generated.

In doing so, the root node is generated first and under it, additional groups or leaves are suspended. The root node is passed onto the TreeControl as a data model.

The procedure corresponds to the provision of display data for the TreeControl. In contrast to the TreeControl, however, the TreeListControl should present additional columns. To do so, our Bean, which provides the display data, must merely implement additional properties for the corresponding columns. In our example, what is involved is the class RegionDsp, from which group and leaf nodes are derived.

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