Bug 122687 Libraries dont appear to allow background colors on tables to be used
If I create a table and set the background color to blue in my library and then drag the table from the library to the report the background color does not go with it.
model/org.eclipse.birt.report.model/src/org/eclipse/birt/report/model/core/DesignElement.java
* 
	 * @return The element definition. Will always be non-null in a valid build.
	 */
	public IElementDefn getDefn( )
	{
		if ( cachedDefn == null )
		{
			cachedDefn = MetaDataDictionary.getInstance( ).getElement(
					getElementName( ) );
			assert cachedDefn != null;
		}
		return cachedDefn;
	}
	/**
	 * Adds a user-defined property. The property must be unique within the
	 * inheritance hierarchy of this element. It cannot duplicate either another
	 * user-defined property or a system-defined property. These checks must
	 * have been enforced by the application prior to calling this method.
	 * <p>
	 * Part of: User-defined property system.
	 * 
	 * @param userProp
	 *            definition of the user-defined property
	 */
	public void addUserPropertyDefn( UserPropertyDefn userProp )
	{
		assert getDefn( ).allowsUserProperties( );
		assert userProp != null;
		String propName = userProp.getName( );
		assert getUserPropertyDefn( propName ) == null;