Hi,
You can't change the hierarchy of the nodes in the tree. But I think you can change the text.
"BindingList^1" in this case is the caption of the band in the grid. You probably never set a caption, so it's falling back to the band's Key. Try setting grid.DisplayLayout.Band.Header.Caption to "Columns" and I think that should work. If not, try Band.AddNewButtonCaption and see if it picks that up.
The word "Named References" doesn't come from the grid, obviously. Nor from any public property. But it is localizable in the CalcManager assembly. So you could change it by localizing the "Operand_Category_NamedReferences" string. Here are a few links that explain how to localize strings in the Infragistics assemblies:
Customizing Assembly Resource Strings
Assembly Resource Strings