Bug 188283 Bubbles should be z-sorted by size in Bubble charts
Biggest bubbles should be drawn first so that there is no small bubble hidden by a bigger one.
chart/org.eclipse.birt.chart.engine/src/org/eclipse/birt/chart/event/WrappedInstruction.java
}
					else
					{
						( (BoundsImpl) bo ).max( ( (PrimitiveRenderEvent) alEvents.get( i ) ).getBounds( ) );
					}
				}
				catch ( Exception ex )
				{
					ex.printStackTrace( );
				}
			}
			return bo;
		}
		return null;
	}
	/**
	 * @return Returns if wraps multiple events currently.
	 */
	public boolean isModel( )
	{
		return pre == null;
	}
	/**
	 * @return Returns list of events currently wraps.
	 */
	public ArrayList getModel( )
	{
		return alEvents;
	}
}