private void btnSettings_Click(object sender, RoutedEventArgs e)
{
if (sw == null)
{
sw = new SettingWindow();
sw.Show();
}
else
{
sw.WindowState = WindowState.Normal;
sw.Focus();
}
sw.Closed += new EventHandler(sw_Closed);
}
private void sw_Closed(object sender, EventArgs e)
{
sw = null;
}