Bug 161429 center position missing for gantt chart
When designing a gantt chart, it should be possible to display the labels inside the bar, using a new "center" attribute. See how it should like in UI and output in attached screenshot.
chart/org.eclipse.birt.chart.ui.extension/src/org/eclipse/birt/chart/ui/swt/wizard/format/popup/series/SeriesLabelSheet.java
String[] ns = LiteralHelper.horizontalPositionSet.getDisplayNames( );
					for ( int i = 0; i < ns.length; i++ )
					{
						cmbPosition.add( ns[i] );
					}
				}
				else
				{
					String[] ns = LiteralHelper.verticalPositionSet.getDisplayNames( );
					for ( int i = 0; i < ns.length; i++ )
					{
						cmbPosition.add( ns[i] );
					}
				}
			}
			
			if ( ( positionScope & LabelAttributesComposite.ALLOW_HORIZONTAL_POSITION ) != 0 )
			{
				if ( context.getModel( ) instanceof ChartWithAxes
						&& isFlippedAxes( ) )
				{
					String[] ns = LiteralHelper.verticalPositionSet.getDisplayNames( );
					for ( int i = 0; i < ns.length; i++ )
					{
						cmbPosition.add( ns[i] );
					}
				}
				else
				{
					String[] ns = LiteralHelper.horizontalPositionSet.getDisplayNames( );