Bug 120317 Set "dimension" property to 3D in "properties" view, error appears in layout editor.
Description: Set "dimension" property to 3D in "properties" view, error appears in layout editor. Steps to reproduce: 1. Add a 2D chart in property editor. 2. Set its dimension property to "three-dimension" in properties view. 3. Error appears in chart.
model/org.eclipse.birt.report.model/src/org/eclipse/birt/report/model/metadata/ExtensionLoader.java
/**
		 * Loads one visibility rule of a system property definition.
		 * 
		 * @param propTag
		 *            the property tag
		 * @param elementDefn
		 *            element definition
		 * @throws ExtensionException
		 *             if the class some attribute specifies can not be
		 *             instanced.
		 */
		void loadPropertyVisibility( IConfigurationElement propTag,
				ExtensionElementDefn elementDefn ) throws ExtensionException
		{
			String name = propTag.getAttribute( NAME_ATTRIB );
			String visible = propTag.getAttribute( VISIBILITY_ATTRIB );
			checkRequiredAttribute( NAME_ATTRIB, name );
			elementDefn.addPropertyVisibility( name, visible );
		}
		/**
		 * Loads the properties of one group.
		 * 
		 * @param elementTag
		 *            the element tag
		 * @param propGroupTag
		 *            the property group tag
		 * @param elementDefn
		 *            element definition
		 * @param propList
		 *            the property list into which the new property is added.