WPF - Closing Application

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Everyone:

When working with winform applications, you could check the reason for
closing the window. As in this example:
private void MainForm_FormCl osing(object sender,
FormClosingEven tArgs e)
{
if (e.CloseReason == CloseReason.Use rClosing)
{
if (CloseApplicati on())
Application.Exi t();

else
e.Cancel = true;

}
}

Now, e doesn't return a closereason. Is there anyway to check why the
window is closing?

Thanks,
Dale Williams