Bug 127791 [preferences] new compiler option COMPILER_PB_FALLTHROUGH_CASE
org.eclipse.jdt.ui/ui/org/eclipse/jdt/internal/ui/preferences/ProblemSeveritiesConfigurationBlock.java
label= PreferencesMessages.ProblemSeveritiesConfigurationBlock_pb_discourraged_reference_label; 
		addComboBox(inner, label, PREF_PB_DISCOURRAGED_REFERENCE, errorWarningIgnore, errorWarningIgnoreLabels, 0);
		
		
		
		label= PreferencesMessages.ProblemSeveritiesConfigurationBlock_section_unnecessary_code; 
		excomposite= createStyleSection(composite, label, nColumns);
	
		inner= new Composite(excomposite, SWT.NONE);
		inner.setFont(composite.getFont());
		inner.setLayout(new GridLayout(nColumns, false));
		excomposite.setClient(inner);
		
		label= PreferencesMessages.ProblemSeveritiesConfigurationBlock_pb_unused_local_label; 
		addComboBox(inner, label, PREF_PB_UNUSED_LOCAL, errorWarningIgnore, errorWarningIgnoreLabels, defaultIndent);
		label= PreferencesMessages.ProblemSeveritiesConfigurationBlock_pb_unused_parameter_label; 
		addComboBox(inner, label, PREF_PB_UNUSED_PARAMETER, errorWarningIgnore, errorWarningIgnoreLabels, defaultIndent);
		
		label= PreferencesMessages.ProblemSeveritiesConfigurationBlock_pb_signal_param_in_overriding_label; 
		addCheckBox(inner, label, PREF_PB_SIGNAL_PARAMETER_IN_OVERRIDING, enabledDisabled, extraIndent);
		
		label= PreferencesMessages.ProblemSeveritiesConfigurationBlock_pb_unused_imports_label; 
		addComboBox(inner, label, PREF_PB_UNUSED_IMPORT, errorWarningIgnore, errorWarningIgnoreLabels, defaultIndent);
		label= PreferencesMessages.ProblemSeveritiesConfigurationBlock_pb_unused_private_label; 
		addComboBox(inner, label, PREF_PB_UNUSED_PRIVATE, errorWarningIgnore, errorWarningIgnoreLabels, defaultIndent);
		
		label= PreferencesMessages.ProblemSeveritiesConfigurationBlock_pb_unnecessary_else_label; 
		addComboBox(inner, label, PREF_PB_UNNECESSARY_ELSE, errorWarningIgnore, errorWarningIgnoreLabels, defaultIndent);
		
		label= PreferencesMessages.ProblemSeveritiesConfigurationBlock_pb_unnecessary_type_check_label;