read selected row in treeWidget

[takechi]

Dear all!
i have a treewidget display data from xml file as picture below


how do show full information at row i selected in the same treewidget.

connect(treeWidget, SIGNAL(itemDoubleClicked(QTreeWidgetItem*,int)), this, SLOT(openItem()));
 
 
void MainWindow::openItem()
{    
    treeWidget->clear();
[COLOR="red"]//what should i do at here[/COLOR]
 
}

connect(treeWidget, SIGNAL(itemDoubleClicked(QTreeWidgetItem*,int)), this, SLOT(openItem()));


void MainWindow::openItem()
{    
    treeWidget->clear();
[COLOR="red"]//what should i do at here[/COLOR]

}

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thanks and best regards.
Newbie.