gtk:tree-view-column-sort-indicator (object)

object -- a gtk:tree-view-column object
setting -- true to display an indicator that the tree view column is sorted

Accessor of the sort-indicator slot of the gtk:tree-view-column class. Call this function with a setting of true to display an arrow in the header button indicating the tree view column is sorted. Call the gtk:tree-view-column-sort-order function to change the direction of the arrow.