Insert a column that calls $func every time it needs to fetch the data for a cell. $func will get a cell renderer, the tree model, and the iter of the row in question, and should set the proper value into the cell renderer.

Finds the path at the point ($x, $y), relative to widget coordinates. That is, $x and $y are relative to an event's coordinates. $x and $y must come from an event on the $tree_view only where $event->window == $tree_view->get_bin_window. It is primarily for things like popup menus. In scalar context, returns the Gtk2::TreePath, in array context, adds the Gtk2::TreeViewColumn, and $x and $y translated to be relative to the cell. This function is only meaningful if $tree_view is realized.