Bug 188027 PasteAction is diabled
model/org.eclipse.birt.report.model/src/org/eclipse/birt/report/model/api/DesignElementHandle.java
* 
	 * @param prop
	 *            the user property definition to add. The name and property
	 *            type must be valid.
	 * @throws UserPropertyException
	 *             if the element is not allowed to have user property or the
	 *             user property definition is invalid, or if the value of the
	 *             user-defined choice is invalid for the type of user property
	 *             definition, the property type is incorrect.
	 */
	public void addUserPropertyDefn( UserPropertyDefn prop )
			throws UserPropertyException
	{
		DesignElement element = getElement( );
		UserPropertyCommand cmd = new UserPropertyCommand( module, element );
		cmd.addUserProperty( prop );
	}
	/**
	 * Adds a report item to the given slot at the given position. The item must
	 * be newly created and not yet added to the design.
	 * 
	 * @param child
	 *            handle to the newly created element
	 * @param slotId
	 *            slot id in which the child item will be added.
	 * @param pos
	 *            position in the slot that the child item will be added.
	 * @throws ContentException
	 *             if the element is not allowed in the slot
	 * @throws NameException