EDIT

import org.eclipse.swt.SWT;

import org.eclipse.swt.layout.GridData;

import org.eclipse.swt.widgets.Composite;

import org.eclipse.swt.widgets.Control;

import org.eclipse.swt.widgets.Label;

    StringFieldEditor openUrl;

    IntegerFieldEditor maxWidth;

    IntegerFieldEditor maxHeight;

    StringFieldEditor mapService;

    @Override

    protected Control createContents(Composite parent) {

       Composite top = new Composite(parent, SWT.LEFT);

       GridData gridData = new GridData(GridData.FILL_HORIZONTAL);

       top.setLayoutData(gridData);

       Label mobot = new Label(top, SWT.NULL);

       mobot.setText("Mobot Open Url Service");

       GridData gridDataLabel = new GridData(GridData.FILL_HORIZONTAL);

       gridDataLabel.horizontalSpan=2;

       mobot.setLayoutData(gridDataLabel);

       openUrl = new StringFieldEditor(PreferencesUtil.createPreferenceString(IPreferenceKeys.OPENURL_ACCESS_POINT),

               "Access Point:", top);

       openUrl.setPreferenceStore(getPreferenceStore());

       openUrl.load();

       Label reference = new Label(top, SWT.NULL);

       reference.setText("BHL Reference Image");

       reference.setLayoutData(gridDataLabel);

       maxWidth = new IntegerFieldEditor(

               PreferencesUtil.createPreferenceString(IPreferenceKeys.OPENURL_IMAGE_MAX_WIDTH),

               "Maximum Width",

               top);

       maxWidth.setPreferenceStore(getPreferenceStore());

       maxWidth.load();

       maxHeight = new IntegerFieldEditor(

               PreferencesUtil.createPreferenceString(IPreferenceKeys.OPENURL_IMAGE_MAX_HEIGHT),

               "Maximum Height",

               top);

       maxHeight.setPreferenceStore(getPreferenceStore());

       maxHeight.load();

       Label mapServiceLabel = new Label(top, SWT.NULL);

       mapServiceLabel.setText("EDIT Map Service:");

       mapServiceLabel.setLayoutData(gridDataLabel);

       mapService = new StringFieldEditor(PreferencesUtil.createPreferenceString(

               IPreferenceKeys.EDIT_MAP_SERVICE_ACCES_POINT),

               "Access Point", top);

       mapService.setPreferenceStore(getPreferenceStore());

       mapService.load();

       return top;

    }