Inserts a new row after sibling. If sibling is NULL, then the row will be
prepended to parent 's children. If parent and sibling are NULL, then
the row will be prepended to the toplevel. If both sibling and parent are
set, then parent must be the parent of sibling. When sibling is set,
parent is optional.
iter will be changed to point to this new row. The row will be empty after
this function is called. To fill in values, you need to call
gtk_tree_store_set() or gtk_tree_store_set_value().
Inserts a new row after sibling. If sibling is NULL, then the row will be prepended to parent 's children. If parent and sibling are NULL, then the row will be prepended to the toplevel. If both sibling and parent are set, then parent must be the parent of sibling. When sibling is set, parent is optional. iter will be changed to point to this new row. The row will be empty after this function is called. To fill in values, you need to call gtk_tree_store_set() or gtk_tree_store_set_value().