EDIT

/**

import java.util.Collection;

import java.util.Observable;

import java.util.Observer;

import org.eclipse.jface.action.Action;

import org.eclipse.jface.resource.ImageDescriptor;

import org.eclipse.swt.SWT;

import org.eclipse.swt.events.DisposeListener;

import org.eclipse.swt.events.SelectionEvent;

import org.eclipse.swt.events.SelectionListener;

import org.eclipse.swt.graphics.Color;

import org.eclipse.swt.graphics.ImageData;

import org.eclipse.swt.widgets.Composite;

import org.eclipse.swt.widgets.Control;

import org.eclipse.swt.widgets.Label;

import org.eclipse.ui.forms.events.IExpansionListener;

import eu.etaxonomy.taxeditor.preference.PreferencesUtil;

import eu.etaxonomy.taxeditor.preference.Resources;

import eu.etaxonomy.taxeditor.store.LoginManager;

import eu.etaxonomy.taxeditor.ui.element.CdmFormFactory;

/**

 * other elements of type ELEMENT to them.

 *

 * @param <ENTITY> A CDM entity which should be visualized by this section.

 * @param <ELEMENT> An element that can be added (multiple times) to this entity.

 * @version $Id: $

    protected Composite container;

	private String title;

		this.setText(getTitleString());

		CdmStore.getLoginManager().addObserver(this);

		addDisposeListener(new DisposeListener() {

            @Override

            public void widgetDisposed(DisposeEvent e) {

                CdmStore.getLoginManager().deleteObserver(AbstractEntityCollectionSection.this);

            }

        });

		Action addAction = new Action("add", IAction.AS_PUSH_BUTTON){

			public void run() {

				ELEMENT element = createNewElement();

				if(element != null){

					addElement(element);

                        getSection().setExpanded(true);

                    }

				}

			}

		};

		addAction.setImageDescriptor(new ImageDescriptor() {

			public ImageData getImageData() {

				return ImageResources.getImage(ImageResources.ADD_ICON).getImageData();

			}

		});

		addAction.setToolTipText(getTooltipString());

	}

	 * using this method is discouraged, use updateToolBar() instead

	 */

		setTextClient(createToolbar());

	}

     * using this method is discouraged, use updateToolBar() instead

     */

		setTextClient(null);

	}

			internalUpdateSection(false);

		}

		setSectionTitle();

	 * Sets the title for the section. Adds a "+" sign if the collection is not empty for this section.

	 * Override in subclasses if you want to have a different behaviour.

	 */

	protected void setSectionTitle() {

		if(getCollection(getEntity()) != null && getCollection(getEntity()).size() > 0){

			this.setText(getTitleString() + " +");

		}else{

			this.setText(getTitleString());

		}

	}

	 * Removes all content from the container

	 */

	private void destroyDynamicContent(){

		if(label_empty != null){

			label_empty.dispose();

			label_empty = null;

		}

		removeElements();

	}

	 *

	 * @param changed a boolean.

	protected void internalUpdateSection(boolean changed){

            renderContent(isExpanded());

        }

		if(changed) {

            firePropertyChangeEvent(this);

        }

	/**

	{

		Collection<ELEMENT> elements = getCollection(getEntity());

			forceExpansion = true;

		label_empty = formFactory.createLabel(getLayoutComposite(), getEmptyString());

	}

	 * Creates the widgets for the collection

	 * @param elements a {@link java.util.Collection} object.

	protected void createDynamicContents(Collection<ELEMENT> elements)

		for(final ELEMENT element : elements){

			SelectionAdapter removeListener = new SelectionAdapter(){

				@Override

				public void widgetSelected(SelectionEvent e) {

				}

			};

			boolean modulo = i++%2 == 0;

			String colorResource = modulo ? Resources.COLOR_LIST_EVEN : Resources.COLOR_LIST_ODD;

	/**

	 * Create the specific widget for the element

	 * @param element a ELEMENT object.

	 * @param removeListener a {@link org.eclipse.swt.events.SelectionListener} object.

	 * @param backgroundColor a {@link org.eclipse.swt.graphics.Color} object.

	protected void createElementComposite(ELEMENT element, SelectionListener removeListener, Color backgroundColor){

	public void setBackground(Color color) {

		if(label_empty != null && !label_empty.isDisposed()){

			label_empty.setBackground(color);

		}

		super.setBackground(color);

	}

	 *

	 * @return a {@link java.lang.String} object.

	public String getTitleString() {

		return CdmUtils.Nz(title);

	}

	 * <p>setTitleString</p>

	 *

	 * @param title a {@link java.lang.String} object.

	 */

		this.title = title;

		layout();

    public void expansionStateChanging(ExpansionEvent e) {

	}

    public void expansionStateChanged(ExpansionEvent e) {

			renderContent(isExpanded());

		}else{

			destroyDynamicContent();

		}

		return PreferencesUtil.getPreferenceStore().getBoolean(IPreferenceKeys.SHOULD_EXPAND_SECTION_WHEN_DATA_AVAILABLE);

	}

	 * @param element a ELEMENT object.

	 */

	public void removeElementAndUpdate(ELEMENT element) {

		removeElement(element);

		internalUpdateSection(true);

	}

    public void update(Observable o, Object arg){

	    if(o instanceof LoginManager){

	        updateToolbar();

	    }

	}

    private void updateToolbar() {

        } else {

            removeToolbar();

        }

    }

        return entityCollectionElement;

    }

	 * Get the specific collection of this entity

	 * @param entity a ENTITY object.

	 * @return a {@link java.util.Collection} object.

	public abstract Collection<ELEMENT> getCollection(ENTITY entity);

	 * Create a new Element for this collection

	 * @return a ELEMENT object.

	public abstract ELEMENT createNewElement();

	 * Add an element to the entities collection

	 * @param element a ELEMENT object.

	public abstract void addElement(ELEMENT element);

	 * Remove an element from the entities collection

	 * @param element a ELEMENT object.

	public abstract void removeElement(ELEMENT element);

	 * String to display when the collection is empty

	 * @return a {@link java.lang.String} object.

	public abstract String getEmptyString();

	 *

	 */