Bug 49182 What should canceling setRawClasspath do ?
org.eclipse.jdt.ui/ui/org/eclipse/jdt/internal/ui/preferences/OptionsConfigurationBlock.java
fComboBoxes.add(comboBox);
		return comboBox;
	}
	
	protected void addInversedComboBox(Composite parent, String label, String key, String[] values, String[] valueLabels, int indent) {
		ControlData data= new ControlData(key, values);
		
		GridData gd= new GridData(GridData.HORIZONTAL_ALIGN_BEGINNING);
		gd.horizontalIndent= indent;
		gd.horizontalSpan= 3;
		
		Composite composite= new Composite(parent, SWT.NONE);
		GridLayout layout= new GridLayout();
		layout.marginHeight= 0;
		layout.marginWidth= 0;
		layout.numColumns= 2;
		composite.setLayout(layout);
		composite.setLayoutData(gd);
		
		Combo comboBox= new Combo(composite, SWT.READ_ONLY);
		comboBox.setItems(valueLabels);
		comboBox.setData(data);
		comboBox.setLayoutData(new GridData(GridData.HORIZONTAL_ALIGN_FILL));
		comboBox.addSelectionListener(getSelectionListener());
		
		Label labelControl= new Label(composite, SWT.LEFT | SWT.WRAP);
		labelControl.setText(label);
		labelControl.setLayoutData(new GridData());