private void DeleteBtn_Click(object sender, EventArgs e)
{
int index = CmdList.SelectedIndex;
if ((index >= 0) && (index <= CmdList.Items.Count - 1))
{
DelCmdAt(index);
if (CmdList.Items.Count > 0)
{
CmdList.SetSelected(CmdList.Items.Count - 1, true);
}
else
{
DeleteBtn.Enabled = false;
}
}
}