GridPanel for and TreePanel

[millenovanta]

Hi, I have a complete GridPanelFor, with CRUD operations and some stuff (double click on cell, etc..).
Now I would like to have the same grid with a Tree column.

I suppose it has to be reweritten using TreePanel?!
There is a way to make a TreePanel, without bind it statcally to a Model, and using it like the GridPanelFOR component?
There is a sample of it?

I noticed also that there is a single component called TreeColumn, which can be added to the GridPanelFor. I tried to do it, but the Grid isn't able to load adta, if there is a TreeColumn in it (specially i noticed that rows are created, since the rowNumbererColumn enumerates lines, but no datas are written to fields). Is possible to use that TreeColumn inside a GridPanelFor?

----GridPanelFor...----
.ColumnModel(cm =>
           {
           cm.Columns.Insert(1, new TreeColumn);
           })

Can i do such a thing?

I haven't posted code, because it is too long. If you suggest me what can be useful, I'll post every try.

Thank's.
(Ext 2.2, MVC 3, Razor)

[millenovanta]

How can I dinamically add column for model to a TreePanel?
I found GenericCOlumnBuilder, and GenericModelFieldBuilder.
Are them usable to do it?

Thanks

[millenovanta]

I soved passing Model and Columns via ViewData.
Can it be a final solution?

Thanks