Hi Gilad, 

gbenshim said:

1. Is it possible to export data from UltraTree to Excel?

Anything is possible. But there is no built-in functionality to export a tree to Excel. You would have to write your own code to loop through the tree and create the excel worksheet using the Infragistics Excel engine. 

gbenshim said:

2. If i use multi-column tree, is it possible to add a column chooser?

No, there is no ColumnChooser that works with the tree. Again, you could write one yourself.

gbenshim said:

3. If i use multi-column tree, is it possible to allow use to mark multiple lines?

You can select multiple nodes if that's what you mean. 

gbenshim said:

4. Is it possible to add a context menu to the columns in the UltraTree (again: i use multi-column tree). 

Yes. You would handle the MouseMove event of the tree and assign a context menu based on the current position of the mouse, but this is not very difficult.