Bug 188027 PasteAction is diabled
model/org.eclipse.birt.report.model/src/org/eclipse/birt/report/model/api/DesignElementHandle.java
*            the identifier of the slot for which to obtain a handle
	 * @return the handle for the requested slot
	 */
	public SlotHandle getSlot( int slotID )
	{
		int slotCount = getDefn( ).getSlotCount( );
		if ( slotCount == 0 )
		{
			return null;
		}
		assert 0 <= slotID && slotID < slotCount;
		if ( slotHandles == null )
		{
			slotHandles = new SlotHandle[slotCount];
			for ( int i = 0; i < slotCount; i++ )
			{
				slotHandles[i] = null;
			}
		}
		if ( slotHandles[slotID] == null )
		{
			slotHandles[slotID] = new SlotHandle( this, slotID );
		}
		return slotHandles[slotID];
	}
	/**
	 * Returns an iterator over the properties of this element. This handle
	 * returns all properties defined on this element, whether or not they are
	 * actually set on this element.
	 *