gtk:tree-view-insert-column (view column pos)

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

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

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