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
* numbers in the form according to the current locale. Converts choices and
	 * colors to their localized display names. Returns the localized display
	 * name for an element reference, etc.
	 * 
	 * @param module
	 *            the module
	 * @param prop
	 *            the property definition
	 * @return the localized display value of the property
	 */
	public String getDisplayProperty( Module module, PropertyDefn prop )
	{
		Object value = getProperty( module, prop );
		if ( value == null )
			return null;
		return prop.getDisplayValue( module, value );
	}
	/**
	 * Sets an unresolved extends name. The resolved relationships is not
	 * cached; it must be resolved later.
	 * 
	 * @param name
	 *            the name of the new parent element, or null if this element
	 *            does not extend any other element
	 */
	public void setExtendsName( String name )
	{
		setExtendsElement( null );
		name = StringUtil.trimString( name );
		if ( name == null )