MainWindow in front of child modeless dialog

[jiveaxe]

Hi,
i have a problem managing mainwindow and dialogs; I have created a mainwindow and clicking on a button it opens a modeless dialog: here the calling function:

void MainWindow::viewArticle(const QModelIndex& current)
{
	if(!articleViewer)
	{
		articleViewer = new ArticleViewer(this);
	}
	if articleViewer {
		articleViewer->show();
	} else {
		articleViewer->activateWindow();
	}
}

void MainWindow::viewArticle(const QModelIndex& current)
{
	if(!articleViewer)
	{
		articleViewer = new ArticleViewer(this);
	}
	if articleViewer {
		articleViewer->show();
	} else {
		articleViewer->activateWindow();
	}
}

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even if i can interact with mainWindow it is always behind the child dialog, which occupy a great part of the screen; should be better choosing at any time what window take in front (like in Qt Designer 4).

Any suggestions?

Thanks