Help me create a Radio Tree Panel for ExtJs 4

[ramirez]

In ExtJs 3, I could create a Radio Tree Panel instead of a Checkbox in a Tree Panel, by extending the Ext.tree.TreeNodeUI then overriding the rendering by using an radio input type instead.

Ext.extend(Ext.ux.tree.RadioNode, Ext.tree.TreeNodeUI, {    
    render : function(bulkRender){
    ...
    ...
    }
}

But in ExtJs 4, Ext.tree.TreeNodeUI no longer exist. I am suspecting that the code I should override is the Ext.tree.View, but by looking at its source code, I dont see anything that creates a checkbox or something like it. Maybe I am missing it or probably, I should be looking somewhere else. Which is why I posted this question here.

I will highly appreciate if someone could point me into the right direction. Thank you very much in advance.

[vadimv]

Just some thoughts, looked in tree.View code, and I think you could try to extend the view and override the methods and cfgs which are related to the checkbox, or create a plugin wich will do the same :
1. the css class (checkboxSelector), probably only to change checkbox imgs to radio
2. Change to a radio behavior in the methods: onCheckboxChange, onCheckChange, getChecked.
3. Take care that a root node will have only one child(NodeInterface) with checked set to true.