insertColumn
This inserts the @column into the @tree_view at @position. If @position is -1, then the column is inserted at the end. If @tree_view has “fixed_height” mode enabled, then @column must have its “sizing” property set to be GTK_TREE_VIEW_COLUMN_FIXED.
Return
The number of columns in @tree_view after insertion.
Parameters
column
The GtkTreeViewColumn to be inserted.
position
The position to insert @column in.