Bug 191140 Cross tab - Highlight rule expression does not work
Please refer to the attached report design - I define highlight rule expression on the cross tab item - It fails to apply the rule.
model/org.eclipse.birt.report.model/src/org/eclipse/birt/report/model/command/PropertyCommand.java
* 
	 * @param module
	 *            the root of <code>obj</code>
	 * @param obj
	 *            the element to modify.
	 */
	public PropertyCommand( Module module, DesignElement obj )
	{
		super( module, obj );
	}
	/**
	 * Sets the value of a property.
	 * 
	 * @param propName
	 *            the internal name of the property to set.
	 * @param value
	 *            the new property value.
	 * @throws SemanticException
	 *             if the property is not found.
	 */
	public void setProperty( String propName, Object value )
			throws SemanticException
	{
		checkAllowedOperation( );
		propName = StringUtil.trimString( propName );
		
		ElementPropertyDefn prop = element.getPropertyDefn( propName );
		if ( prop == null )
			throw new PropertyNameException( element, propName );
		setProperty( prop, value );