private void RbEngineCheckedChanged(object sender, EventArgs e)
{
bool newEngineRA2 = rbEngineAuto.Checked || rbEngineRA2.Checked || rbEngineYR.Checked;
if (_currentEngineRa2 && !newEngineRA2 && tbMixDir.Text == FindMixDir(true))
tbMixDir.Text = FindMixDir(false);
else if (!_currentEngineRa2 && newEngineRA2 && tbMixDir.Text == FindMixDir(false))
tbMixDir.Text = FindMixDir(true);
_currentEngineRa2 = newEngineRA2;
UpdateCommandline();
}