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Redefining cell types

I need to redefine a tree cell (tree) to a combobox (co) cell. is this possible? Im trying using setCellExcelType and using it at onCellEdit event stage 0. The combobox is defined well, but I got a javascript error. In stage 2 of onCellEdit I need to change from combobox to tree again, using userdata to save the value and the combobox label to be displayed as a part of tree.  Do you have any example of how to do things like this?? I know this is a strange question but this is the best way to allow users to update/insert data in my system.

setCellExcelType can be used in such scenario, but "tree" excell is kind of special, it stores info about hierarchy, so redefining it can cause a problems..
If you have a selectbox with predefined list of values, you can just update code of dhtmlxTreeGrid.js and create a selectbox instead of input.

In dhtmlXTreeGrid.js

this.er.innerHTML="<textarea....
    can be replaced with
this.er.innerHTML="<select....

Basically it is possible to move existing functionality of "co" or "combo" excell in "tree" excell, but it is no so simple task.