No icon with QStyleOptionButton

I have got a weird problem.

I need to have some buttons in my QTableView. I used to use QAbstractItemView::setIndexWidget() method, but it is not very responsible when working with larger models. Therefore I decided to switch to QStyledItemDelegate. My buttons have icons (and icons only, no text). When working with setIndexWidget, I used the following code:

Code:

---

ClientDetailsButton::ClientDetailsButton(const Client* _client,
                                         QWidget* _parent) :
    QPushButton("", _parent),
    __current(_client) {
 
  setIcon(QIcon(":/uiIcons/button-details.png"));
}

---

And it worked perfectly. But when I switch to delegate, I use it like that:

Code:

---

QStyleOptionButton button;
button.rect = _option.rect;
button.text.clear();
button.icon = QIcon(":/uiIcons/button-details.png");
button.state = _option.state | QStyle::State_Enabled;
 
if (_index == __button)
  button.state |= QStyle::State_Sunken;
 
QApplication::style()->drawControl(QStyle::CE_PushButton, &button, _painter);

---

The button itself is fine, but its empty. There is no icon visible. Suprisingly, when I use, for example:

Code:

---

button.icon = QIcon::fromTheme("dialog-information", QIcon(":/uiIcons/button-details.png"));

---

the theme icon is visible. But if Qt cannot find the theme icon, the replacement is still blank. I tried everything I could think of and have no idea why it doesn't work. Anyone has any ideas?

Maybe too late, but maybe interesting also for others...
You have to set the size of the image too.. (button.iconSize = QSize(32,32);)