* GUI: Added a Data property to the TreeNode class. Now any object or data can be associated with a tree node.
* GUI: Added a Data property to the TreeNode class. Now any object or data can be associated with a tree node.

wkitty42/fpGUI,wkitty42/fpGUI,wkitty42/fpGUI,wkitty42/fpGUI,wkitty42/fpGUI,wkitty42/fpGUI