Bug 127791 [preferences] new compiler option COMPILER_PB_FALLTHROUGH_CASE
org.eclipse.jdt.ui/ui/org/eclipse/jdt/internal/ui/preferences/ProblemSeveritiesConfigurationBlock.java
PREF_PB_UNDOCUMENTED_EMPTY_BLOCK, PREF_PB_FINALLY_BLOCK_NOT_COMPLETING, PREF_PB_DEPRECATION_WHEN_OVERRIDING,
				PREF_PB_UNUSED_DECLARED_THROWN_EXCEPTION_WHEN_OVERRIDING, PREF_PB_MISSING_SERIAL_VERSION, 
				PREF_PB_PARAMETER_ASSIGNMENT, PREF_PB_NULL_REFERENCE,
				PREF_15_PB_UNCHECKED_TYPE_OPERATION, PREF_15_PB_FINAL_PARAM_BOUND, PREF_15_PB_VARARGS_ARGUMENT_NEED_CAST,
				PREF_15_PB_AUTOBOXING_PROBLEM, PREF_15_PB_MISSING_OVERRIDE_ANNOTATION, PREF_15_PB_ANNOTATION_SUPER_INTERFACE,
				PREF_15_PB_TYPE_PARAMETER_HIDING, PREF_15_PB_INCOMPLETE_ENUM_SWITCH, PREF_PB_MISSING_DEPRECATED_ANNOTATION,
				PREF_15_PB_RAW_TYPE_REFERENCE, 
				PREF_PB_FORBIDDEN_REFERENCE, PREF_PB_DISCOURRAGED_REFERENCE, PREF_PB_SUPPRESS_WARNINGS, PREF_PB_UNHANDLED_WARNING_TOKEN
			};
	}
	
	/*
	 * @see org.eclipse.jface.preference.PreferencePage#createContents(Composite)
	 */
	protected Control createContents(Composite parent) {
		fPixelConverter= new PixelConverter(parent);
		setShell(parent.getShell());
		
		Composite mainComp= new Composite(parent, SWT.NONE);
		mainComp.setFont(parent.getFont());
		GridLayout layout= new GridLayout();
		layout.marginHeight= 0;
		layout.marginWidth= 0;
		mainComp.setLayout(layout);
		
		Composite commonComposite= createStyleTabContent(mainComp);
		GridData gridData= new GridData(GridData.FILL, GridData.FILL, true, true);
		gridData.heightHint= fPixelConverter.convertHeightInCharsToPixels(20);
		commonComposite.setLayoutData(gridData);