private void CavLockVoltageTrackBar_Scroll(object sender, EventArgs e)
{
double value = ((double)CavLockVoltageTrackBar.Value) / 100;
SetSummedVoltageTextBox(value);
// Check its a UI event!
if (CavLockVoltageTrackBar.Focused)
{
controller.VoltageToMasterLaserChanged(CavityName, value);
}
}