public override void ShowBalloonWindow (IntPtr handle, int timeout, string title, string text, ToolTipIcon icon)
{
Control control = Control.FromHandle(handle);
if (control == null)
return;
if (balloon_window != null) {
balloon_window.Close ();
balloon_window.Dispose ();
}
balloon_window = new NotifyIcon.BalloonWindow (handle);
balloon_window.Title = title;
balloon_window.Text = text;
balloon_window.Icon = icon;
balloon_window.Timeout = timeout;
balloon_window.Show ();
}