Bug 122635 [compiler pref page] Surface the 'Warning on assignments to parameters' new option into the user interface
org.eclipse.jdt.ui/ui/org/eclipse/jdt/internal/ui/preferences/OptionsConfigurationBlock.java
public String getStoredValue(IScopeContext[] lookupOrder, boolean ignoreTopScope, IWorkingCopyManager manager) {
			for (int i= ignoreTopScope ? 1 : 0; i < lookupOrder.length; i++) {
				String value= getStoredValue(lookupOrder[i], manager);
				if (value != null) {
					return value;
				}
			}
			return null;
		}
		
		public void setStoredValue(IScopeContext context, String value, IWorkingCopyManager manager) {
			if (value != null) {
				getNode(context, manager).put(fKey, value);
			} else {
				getNode(context, manager).remove(fKey);
			}
		}
			
		/* (non-Javadoc)
		 * @see java.lang.Object#toString()
		 */
		public String toString() {
			return fQualifier + '/' + fKey;
		}
		public String getQualifier() {
			return fQualifier;
		}
	}
	
	protected static class ControlData {