[gtkmm] Addressing a TreeView cell without using TreeModel

[Igor Gorbounov <igorbounov voronezh serw ru>]

Hi, All!
I need a sheet-like table with programmatically changeable number of 
columns.
So I'm trying to do without any TreeModel, just adding TreeViewColumns with
CellRendererTexts to my TreeView. But how can I add rows?
Well, I've tried an another approach: I've used a TreeModel with only one
field - for the first column. So it is possible to add rows just like it 
is described
in a tutorial. And it is possible to address the row needed, too. But 
only for
this first column. Is there any way to address the cells, that are 
beyond the
TreeModel, cells, that are just added as a TreeViewColumns
(TreeView->append_column("Header", CellRenderer)?
And then, is there any way to fixate the first column while scrolling 
horizontally?
   Hopefully,
      Igor Gorbounov