No CSS in child class

[kartun]

I've my widget "MeasurePanel" inherited from QWidget:

class MeasurePanel : public QWidget
{
    Q_OBJECT
    Q_PROPERTY (int value READ value WRITE setValue)
    Q_PROPERTY (QColor fontColor READ fontColor WRITE setFontColor)
 
 
public:
    explicit MeasurePanel(QWidget *parent = 0);
...

class MeasurePanel : public QWidget
{
    Q_OBJECT
    Q_PROPERTY (int value READ value WRITE setValue)
    Q_PROPERTY (QColor fontColor READ fontColor WRITE setFontColor)


public:
    explicit MeasurePanel(QWidget *parent = 0);
...

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At design time I added CSS to it (and it's displayed correctly @ designer):

QWidget#MeasurePanel{
  border-width: 3px; 
  border-style: inset; 
  border-color: #000000; 
  border-radius: 9px; 
 
	background-color: qlineargradient(spread:pad, x1:0.5, y1:1, x2:0.5, y2:0, stop:0 rgba(116, 38, 116, 255), stop:0.99115 rgba(239, 0, 239, 255));
}

QWidget#MeasurePanel{
  border-width: 3px; 
  border-style: inset; 
  border-color: #000000; 
  border-radius: 9px; 
  
	background-color: qlineargradient(spread:pad, x1:0.5, y1:1, x2:0.5, y2:0, stop:0 rgba(116, 38, 116, 255), stop:0.99115 rgba(239, 0, 239, 255));
}

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In main application I've :

MeasurePanel* panels[4];
...
panels[0] = new MeasurePanel(this);
 
    //panels[0]->setObjectName("MeasurePanel");
 
    qDebug() << panels[0]->objectName();
//    panels[0]->setStyleSheet("MeasurePanel#MeasurePanel{border-width: 3px; border-style: inset; border-color: #000000; border-radius: 9px;}");
    ui->gridLayout->addWidget(panels[0],1,0);

MeasurePanel* panels[4];
...
panels[0] = new MeasurePanel(this);

    //panels[0]->setObjectName("MeasurePanel");

    qDebug() << panels[0]->objectName();
//    panels[0]->setStyleSheet("MeasurePanel#MeasurePanel{border-width: 3px; border-style: inset; border-color: #000000; border-radius: 9px;}");
    ui->gridLayout->addWidget(panels[0],1,0);

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But after this CSS isn't displayed. I checked ObjectName (commented), and it's "MeasurePanel". I've tried CSS in different forms:

• QWidget#MeasurePanel
• QWidget > MeasurePanel
• MeasurePanel#MeasurePanel

But still can't get it working.


Addition :
tried this one :

panels[0]->setProperty("MeasurePanel", true);
    panels[0]->setStyleSheet("*[MeasurePanel=\"true\"]{border-width: 3px; border-style: inset; border-color: #000000;}");

panels[0]->setProperty("MeasurePanel", true);
    panels[0]->setStyleSheet("*[MeasurePanel=\"true\"]{border-width: 3px; border-style: inset; border-color: #000000;}");

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Same thing.

Another addition:
I put everything inside QFrame and now I'm able to edit that frame CSS, but still can't modify Widget CSS.