Bug 176436 Charts Imported from Libraries do not update when libraries change
During a live presentation of BIRT at EclipseCon, we came across a rather embarassing issue. When charts are included in a library, and imported into a report design from a library, any changes to the library instance of the chart do not reflect in the report itself.
model/org.eclipse.birt.report.model/src/org/eclipse/birt/report/model/api/GroupElementHandle.java
*            name of the property.
	 * @param value
	 *            value needs to set.
	 * @throws SemanticException
	 *             if the value is invalid for the property, or the property is
	 *             undefined on the elements.
	 */
	public final void setStringProperty( String propName, String value )
			throws SemanticException
	{
		setProperty( propName, value );
	}
	/**
	 * Checks whether the <code>element</code> is a member of
	 * <code>GroupElementHandle</code>.
	 * 
	 * @param element
	 *            the element to check
	 * @return <code>true</code> if the element is in the list, otherwise
	 *         <code>false</code>.
	 */
	abstract protected boolean isInGroup( DesignElementHandle element );
	/**
	 * An iterator over the properties defined for elements that in the group
	 * element.
	 */
	class GroupPropertyIterator implements Iterator
	{
		/**
		 * The property iterator to traverse the properties.