Bug 163018 An error extension will lead the report contain chart can't be opened and can not new a report.
Details: An error extension will lead the report contain chart can't open In org.eclipse.birt.report.tests.model has an error extension. When run the birt use workbenck, the report contain chart can't be opened and it can not new a report.
model/org.eclipse.birt.report.model/src/org/eclipse/birt/report/model/metadata/ElementDefn.java
{
				String visibility = (String) elementDefn.propVisibilites
						.get( propName );
				if ( visibility != null )
					return visibility;
			}
			elementDefn = elementDefn.parent;
		}
		return null;
	}
	/**
	 * Set the name of the XML element for this ROM element.
	 * 
	 * @param value
	 *            the name of the XML element
	 */
	public void setXmlName( String value )
	{
		xmlName = value;
	}
	/**
	 * 
	 * @return the name of the XML element used to serialize this ROM element.
	 */
	public String getXmlName( )
	{
		return xmlName;
	}
}