Control child style sheet with Pseudo-States?

[xlm94]

I wanted to do something like this in qss:

QPushButton#NewsFeed QLabel#NewsTitle{
    color:...
}
QPushButton#NewsFeed:hover QLabel#NewsTitle{
    color:...
}
QPushButton#NewsFeed QLabel#NewsDate{
    color:...
}
QPushButton#NewsFeed:hover QLabel#NewsDate{
    color:...
}

It's not changing the text style when the button is hovered. Is there a syntax error? Or is it simply not supported?

And if this is not supported, how could I achieve the effect?