[gtkmm] How to hide ScrollBars in ScrolledWindow?

[Iwan van Rienen <iwan iwans net>]

Hi All,

With gtkmm2 I've placed a TreeView in a ScrolledWindow (this all placed in 
a table cell).

I'd like to hide the vertical scrollbar, setting the policy in 
ScrolledWindow to Gtk::POLICY_NEVER or using get_vscrollbar ( ) ->hide() 
does not work as expected.

What do you suggest for hiding the scrollbar?

TIA, Iwan