private void userGuideToolStripMenuItem_Click(object sender, EventArgs e)
 {
     if (!(manual != null && !manual.IsDisposed))
     {
         manual         = new Manual();
         manual.TopMost = true;
         manual.Show();
     }
     else
     {
         manual.Focus();
     }
 }
 private void userGuideToolStripMenuItem_Click(object sender, EventArgs e)
 {
     if (!(manual != null && !manual.IsDisposed))
     {
         manual = new Manual();
         manual.TopMost = true;
         manual.Show();
     }
     else
     {
         manual.Focus();
     }
 }