final Label schemeLabel = new Label(schemeControls, SWT.NONE);
schemeLabel.setText(NewKeysPreferenceMessages.SchemeLabel_Text);
// Create the combo.
schemeCombo = new ComboViewer(schemeControls);
schemeCombo.setLabelProvider(new NamedHandleObjectLabelProvider());
schemeCombo.setContentProvider(new ArrayContentProvider());
gridData = new GridData();
gridData.widthHint = 150;
gridData.horizontalAlignment = SWT.FILL;
schemeCombo.getCombo().setLayoutData(gridData);