Features:
The tree structure is built using HTML tags.
The tree elements have set ElementType="LinkButton". The Click server side
event will occur every time when an element will be clicked. [Note: The Click event handler implements
expand/collapse functionality, that will also fire Expand/Collapse events.]
The Expand/Collapse events will be fired when the expand/collapse buttons
will be clicked.
CSS (Cascading Style Sheets) definitions used to enhance the look.
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