protected function initTools()
    {
        if ($this->expandable === true || $this->collapsable === true) {
            $this->tools[] = [
                'encode' => false,
                'label' => new Icon('chevron-' . ($this->expandable === true ? 'down' : 'up')),
                'linkOptions' => ['class' => 'collapse-link'],
                'url' => null,
            ];
        }
        if (empty($this->headerMenu) === false) {
            $this->tools[] = [
                'encode' => false,
                'items' => $this->headerMenu,
                'label' => new Icon('wrench'),
            ];
        }
        if ($this->removable === true) {
            $this->tools[] = [
                'encode' => false,
                'label' => new Icon('close'),
                'linkOptions' => ['class' => 'close-link'],
                'url' => null,
            ];
        }
    }