Bug 188029 Top face is missing in Area chart of 2D+ with negative values
Top face is missing in Area chart of 2D+ with negative values. Please see attached screenshot.
chart/org.eclipse.birt.chart.engine/src/org/eclipse/birt/chart/computation/withaxes/StackedSeriesLookup.java
iSharedUnitCount++;
									alSGCopies.add( sg );
									ssl.htSeriesToStackGroup.put( se, sg );
									sg.addSeries( se ); 
									
								}
							}
							else
							
							{
								sg = new StackGroup( -1 ); 
								
								
								alSGCopies.add( sg );
								ssl.htSeriesToStackGroup.put( se, sg );
								sg.addSeries( se ); 
							}
						}
						else
						
						
						{
							sg = new StackGroup( -1 );