How to draw a custom border across multiple cells in TreeView?

[Nickolai Dobrynin <ndobrynin gmail com>]

Hi,

I have a simple text table with one short string in each cell.  I
display this table by using TreeView/ListStore, and I would like to
draw a custom border of different color around several cells within
the same row and spawning multiple columns, much in the same way this
is done in spreadsheet programs, where you can stretch the cell
selecting frame to squeeze multiple cells at the same time.  The only
difference is that  there is no stretching, in my case, and all the
selected cells are in the same row.

Put another way, is there anything that lets me draw a different color
frame around several horizontal cells in a text table?

Anybody can please explain how to achieve this?


Best regards,

Nickolai Dobrynin