Bug 209106 BIRT - User properties defined in a library are not seen in properties view
In the attached library there is a grid container. The text control and the row of the table in the grid have two user properties each. We can see them in the library but not when we drag them in to a design. The property does not show up in the properties view
model/org.eclipse.birt.report.model/src/org/eclipse/birt/report/model/core/DesignElement.java
*            the slot id to add
	 */
	public void add( DesignElement content, int slotID )
	{
		getSlot( slotID ).add( content );
		content.setContainer( this, slotID );
	}
	/**
	 * Adds a content to this element.
	 * 
	 * @param content
	 *            the content to add
	 * @param slotID
	 *            the slot id to add
	 * @param posn
	 */
	public void add( DesignElement content, int slotID, int posn )
	{
		getSlot( slotID ).insert( content, posn );
		content.setContainer( this, slotID );
	}
	/**
	 * Removes a content from the given slot.
	 * 
	 * @param content
	 *            the content to remove
	 * @param slotID
	 *            the slot id in which content resides
	 */
	public void remove( DesignElement content, int slotID )