void ChangeManualHUD (NSObject sender)
{
var control = (UISegmentedControl)sender;
ManualHUDPhotoView.Hidden = control.SelectedSegment != 0;
ManualHUDFocusView.Hidden = control.SelectedSegment != 1;
ManualHUDExposureView.Hidden = control.SelectedSegment != 2;
ManualHUDWhiteBalanceView.Hidden = control.SelectedSegment != 3;
ManualHUDLensStabilizationView.Hidden = control.SelectedSegment != 4;
}