customizing QGroupbox title

[FelixB]

Hi,

I want to customize the title of a QGroupBox by using a stylesheet. See the desired result in the attached image (qgroupbox_desired.png). A almost have the layout, but the title background is too small (qgroupbox_wrong_title.png). how can I extend the title over the whole width?

my stylesheet:

QGroupBox
{
    background-color:transparent;
    border-bottom-left-radius: 3px;
    border-bottom-right-radius: 3px;
    border: 1px solid #acacac;
    border-top: none;
    margin-top: 5px;
}
 
QGroupBox::title
{
    subcontrol-origin: margin;	
    background:url(:/assets/subWindowBackground);
    border-top-left-radius: 3px;
    border-top-right-radius: 3px;
    border: 1px solid #0b477b;
    border-bottom: none;
    background-color: qlineargradient(x1: 0, y1: 0, x2: 0, y2: 1,
        stop: 0 #005192, stop: 1 #002f60);
    padding: 2 2px;
    color: white;   
}

QGroupBox
{
    background-color:transparent;
    border-bottom-left-radius: 3px;
    border-bottom-right-radius: 3px;
    border: 1px solid #acacac;
    border-top: none;
    margin-top: 5px;
}

QGroupBox::title
{
    subcontrol-origin: margin;	
    background:url(:/assets/subWindowBackground);
    border-top-left-radius: 3px;
    border-top-right-radius: 3px;
    border: 1px solid #0b477b;
    border-bottom: none;
    background-color: qlineargradient(x1: 0, y1: 0, x2: 0, y2: 1,
        stop: 0 #005192, stop: 1 #002f60);
    padding: 2 2px;
    color: white;   
}

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thanks in advance!
Felix