I have a tree set up like a tag browse tree to dynamically build a time series chart. I am looking for a way to show on the tree which items have been added to the chart already. I have the tags showing in a legend but I need a way for someone to be able to take tags back off the chart that have already been added. I want to do this by changing either the icon, background color or text of the item so they stand out on the tree. Is there a way to access these parameters for each item individually?