[Qt-interest] stylesheet standard button names

[_h_]

Hi,
Stylesheet uses the standard button names for example the stylesheet
for QDockWidget uses the 'titlebar-close-icon'...
QDockWidget {
...
titlebar-close-icon: url(close.png);
...
}
can i use the titlebar-close-icon in program to connect the
signal/slot with this button ?

Also please let me know, is there any mechanism available in
stylesheet via which I can call the function, like in X11/Motif
translation functions.
Thank you.