insert
Creates a new row at @position.
If parent is non-null, then the row will be made a child of @parent. Otherwise, the row will be created at the toplevel.
If @position is -1
or is larger than the number of rows at that level, then the new row will be inserted to the end of the list.
The @iter parameter 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().
Parameters
iter
An unset GtkTreeIter
to set to the new row
parent
A valid GtkTreeIter
position
position to insert the new row, or -1 for last