用于QWidget的clicked()信号打破了样式表

我想将QWidget-container的clicked()信号连接到我的插槽.所以我写了这段代码:

HPP:

class LinkWidget : public QWidget
{
    Q_OBJECT

public:
    explicit LinkWidget(QWidget * parent = 0 );
    ~LinkWidget();

signals:
    void clicked();

protected:
    void mousePressEvent(QMouseEvent * event ) ;
};

CPP:

LinkWidget::LinkWidget(QWidget * parent) :
    QWidget(parent)
{

}

LinkWidget::~LinkWidget()
{

}

void LinkWidget::mousePressEvent(QMouseEvent * event)
{
    emit clicked();
}

一切正常,但我不能再将样式表分配给这个小部件了:

这样可行:

QWidget * statuspanel = new QWidget(this);
statuspanel->setSizePolicy(QSizePolicy::Expanding, QSizePolicy::Fixed);
statuspanel->setMinimumHeight(20);
statuspanel->setMaximumHeight(20);
statuspanel->setStyleSheet("border-bottom: 1px solid rgb(206, 203, 186);"
                           "border-right : 1px solid rgb(206, 203, 186);");

那不是:

LinkWidget * statuspanel = new LinkWidget(this);
statuspanel->setSizePolicy(QSizePolicy::Expanding, QSizePolicy::Fixed);
statuspanel->setMinimumHeight(20);
statuspanel->setMaximumHeight(20);
statuspanel->setStyleSheet("border-bottom: 1px solid rgb(206, 203, 186);"
                           "border-right : 1px solid rgb(206, 203, 186);");

我究竟做错了什么？

谢谢!