void da_Completed(object sender, EventArgs e)
{
Window window = Window.GetWindow(this);
IModalService modalService = window as IModalService;
if (DialogResult == Miscellaneous.ModalDialogResult.OK)
{
modalService.GoBackward(true);
}
if (DialogResult == Miscellaneous.ModalDialogResult.Cancel)
{
modalService.GoBackward(false);
}
}