gtk-tree-view-insert-column (view column position)

view -- a gtk-tree-view widget
column -- the gtk-tree-view-column object to be inserted
position -- an integer with the position to insert column in

An integer with the number of columns in view after insertion.

This inserts the column into the view at the given position. If position is -1, then the column is inserted at the end. If view has the fixed-height-mode property enabled, then column must have its sizing property set to be :fixed.