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/render/DeferredCache.java
{
					ArrayList al = wi.getModel( );
					for ( int j = 0; j < al.size( ); j++ )
					{
						PrimitiveRenderEvent pre = (PrimitiveRenderEvent) al.get( j );
						pre.fill( idr );
						pre.draw( idr );
					}
				}
				else
				{
					wi.getEvent( ).iObjIndex = i + 1;
					switch ( wi.getInstruction( ) )
					{
						case PrimitiveRenderEvent.FILL
								| PrimitiveRenderEvent.DRAW :
							wi.getEvent( ).fill( idr );
							wi.getEvent( ).draw( idr );
							break;
						case PrimitiveRenderEvent.FILL :
							wi.getEvent( ).fill( idr );
							break;
						case PrimitiveRenderEvent.DRAW :
							wi.getEvent( ).draw( idr );
							break;
					}
				}
			}
			alPlaneShadows.clear( );
		}