Ext.ux.HistoryTree plugin - tree with history

Good day.
I want to share ExtJux plugin Ext.ux.HistoryTree - tree with history:
- For all tree transitions (opening / hiding a branch, selecting a branch), the Back / Forward buttons work;
- The URL of the browser is always a direct link to the current state of the tree.

Demo and API

Compatibility:
- IE6 + (with certain restrictions), FF, Opera, Safari, Chrome;
- ExtJS version 2.3.0, 3.2.1 (these are all versions that I tested).
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I needed a tree with history for the application I was developing, but then I decided to design it as a plug-in. Perhaps someone will be useful.

I will be glad to comments and suggestions on the work of the plugin.