Bug 176450 Support link to CSS Feature(Model Part)
model/org.eclipse.birt.report.model/src/org/eclipse/birt/report/model/util/ModelUtil.java
{
		ElementRefValue refValue = (ElementRefValue) element.getLocalProperty(
				module, IDesignElementModel.EXTENDS_PROP );
		if ( refValue == null )
			return true;
		
		if ( element.getDefn( ).isContainer( ) && !refValue.isResolved( ) )
			return false;
		
		DesignElement parent = element.getExtendsElement( );
		while ( parent != null )
		{
			if ( !isValidReferenceForCompoundElement( parent.getRoot( ), parent ) )
				return false;
			parent = parent.getExtendsElement( );
		}
		return true;
	}
	/**
	 * Get virtual parent or extended parent.
	 * 
	 * @param element
	 *            design element which wants to get its parent.
	 * @return parent of element.
	 */
	public static DesignElement getParent( DesignElement element )
	{
		DesignElement parent = null;
		if ( element.isVirtualElement( ) )
		{