I'm working with TreeView today and it seems like it would be convenient if 
TreeItem had a Text property in addition to it's Graphic property. This would 
seem to solve the most common need for a custom TreeCell factory.

Since most trees basically show a tree of labels, it would seem to make as much 
sense as the Graphic property.

It might have been sufficient if the default rendering used TreeItem.toString() 
instead of TreeItem.getValue().toString(), although this would miss the free 
updating you could get by resetting a TreeItem.Text property dynamically.


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