QScroller with QTreeView missing doubleClicked() event

Hi,
I have problem with qscroller on the qtreeview because when I set scroller like this

Code:

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QScroller::grabGesture( ui->treeView, QScroller::LeftMouseButtonGesture );

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I can't catch doubleClicked() event.

Code:

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connect( ui->treeView, SIGNAL(doubleClicked(QModelIndex)), this,
                                SLOT(detectDoubleClicked(QModelIndex)) );

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I know that it QScroller stoped this event but i don't know how to fix it,
can you help me? ;)