setViewMode issue of QFileDialog

[nikhilqt]

QFileDialog l_pFiledDlg;
QString sFilename1;
l_pFiledDlg.setViewMode(QFileDialog::Detail);
sFilename1 =  l_pFiledDlg.getOpenFileName(this,tr("Open Files"), sPath, tr("All Files (*.*)"));

QFileDialog l_pFiledDlg;
QString sFilename1;
l_pFiledDlg.setViewMode(QFileDialog::Detail);
sFilename1 =  l_pFiledDlg.getOpenFileName(this,tr("Open Files"), sPath, tr("All Files (*.*)"));

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Using the above code the filedialog which opens is showing "list" as its view mode. It is not changing to "detail" view by default.

I think everything seems correct, but I do not know why it is not working?