if(ValueNode_Const::Handle::cast_dynamic(value_desc.get_value_node()))
{
Action::Handle action(ValueNodeConstSet::create());
if(ValueNode_Const::Handle::cast_dynamic(value_desc.get_value_node()))
{
Action::Handle action(ValueNodeConstSet::create());
action->set_param("canvas",get_canvas());
action->set_param("canvas_interface",get_canvas_interface());
action->set_param("value_node",value_desc.get_value_node());
action->set_param("canvas",get_canvas());
action->set_param("canvas_interface",get_canvas_interface());
action->set_param("value_node",value_desc.get_value_node());