public function addActionColumn($key, $name, $widthCoefficient, $callback, $renderer)
    {
        $this->columns[] = new ActionColumn($key, $name, $widthCoefficient, $callback, $renderer);

        return $this;
    }
public function addActionColumn($key, $name, $widthCoefficient, $callback, $renderer)
    {
        $this->columns[] = new ActionColumn($key, $name, $widthCoefficient, $callback, $renderer);

        return $this;
    }
public function addActionColumn ( $ key , $ name , $ widthCoefficient , $ callback , $ renderer ) { $ this -> columns [ ] = new ActionColumn ( $ key , $ name , $ widthCoefficient , $ callback , $ renderer ) ; return $ this ; }
Add an action into a column.

@param string     $key
@param string     $name
@param integer    $widthCoefficient
@param callable   $callback
@param Renderable $renderer

@return $this
Add an action into a column .