action->set_param("canvas",get_canvas());
action->set_param("canvas_interface",get_canvas_interface());
action->set_param("value_desc",ValueDesc(value_node,0));
action->set_param("item",child);
action->set_param("canvas",get_canvas());
action->set_param("canvas_interface",get_canvas_interface());
action->set_param("value_desc",ValueDesc(value_node,0));
action->set_param("item",child);