iterChildren
Sets @iter to point to the first child of @parent.
If @parent has no children, false is returned and @iter is set to be invalid. @parent will remain a valid node after this function has been called.
If @parent is null returns the first node, equivalent to gtk_tree_model_get_iter_first (tree_model, iter);
Return
true, if @iter has been set to the first child
Parameters
iter
the new GtkTreeIter
to be set to the child
parent
the GtkTreeIter