svg icons not showing up

[ePharaoh]

I have this code, which shows a blank widget!

{
           QToolButton *toolButton = new QToolButton(0);
           QIcon *newTabIcon = new QIcon("newTab.svg");
           toolButton->setIcon (*newTabIcon);
           mainSplitter->addWidget(toolButton);
}

{
           QToolButton *toolButton = new QToolButton(0);
           QIcon *newTabIcon = new QIcon("newTab.svg");
           toolButton->setIcon (*newTabIcon);
           mainSplitter->addWidget(toolButton);
}

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Is this the right way to use SVGs in qt 4.1.1?