public AccessibleField getAccessibleField(int fieldNum) {
		if (fieldNum < 0 || fieldNum >= fieldsCache.length) {
			return null;
		}
		if (fieldsCache[fieldNum] == null) {
			fieldsCache[fieldNum] = createAccessibleField(fieldNum);
		}
		return fieldsCache[fieldNum];
	}
Returns the n'th AccessibleField that is visible on the screen.
@param fieldNum the number of the field to get
@return the n'th AccessibleField that is visible on the screen
Ghidra/Framework/Docking/src/main/java/docking/widgets/fieldpanel/AccessibleFieldPanelDelegate.java