if (selectedThresholdItem == AnnotationColourGradient.NO_THRESHOLD)
{
slider.setEnabled(false);
thresholdValue.setEnabled(false);
thresholdValue.setText("");
if (selectedThresholdItem == AnnotationColourGradient.NO_THRESHOLD)
{
slider.setEnabled(false);
thresholdValue.setEnabled(false);
thresholdValue.setText("");