+ get_canvas()->set_time(cur_time_=x);
+
+ // update the time in all the child canvases
+ Canvas::Children children = get_canvas()->get_root()->children();
+ handle<CanvasInterface> interface;
+ for (Canvas::Children::iterator iter = children.begin(); iter != children.end(); iter++)
+ if ((interface = get_instance()->find_canvas_interface(*iter)) != this)
+ interface->set_time(interface->get_canvas()->get_time());
+