[gtkada] Custom widget in Gtk_Tree_View_Column

[Rob]

Hello,

I am trying to set a custom widget in the header of Gtk_Tree_View_Column,
in my case Gtk_Vbox with some labels and Hseparators. Setting the widget
is no problem and verifiying with Column.Get_Widget confirms that the
widget is set. The columns are not clickable.
However, nothing is shown in the tree view header. Do I need to do more
than setting the widget, like calling Show_All on it?

Regards,
Rob Groen