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This example illustrates a tree menu with books and documents.
The tree menu has the following features:
- the tree does NOT use lines;
- the tree uses plus/minus images for expanding/collapsing tree nodes;
- the tree uses custom images associated with tree nodes: books for expandable nodes and documents for non-expandable nodes;
- the tree has a transparent background;
- selected nodes are highlighted;
- node text is underlined when the user moves the mouse over it;
- expandable nodes are expanded/collapsed when the user clicks over node's image or text;
- status text is displayed when the user moves the mouse over node's text, image or plus/minus image.
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