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
{
		DataPointComponent dpc = (DataPointComponent) getSeriesForProcessing( ).getDataPoint( )
				.getComponents( )
				.get( getIndexOfListItem( iComponentIndex ) );
		FormatSpecifier formatspecifier = dpc.getFormatSpecifier( );
		String sContext = new MessageFormat( Messages.getString( "OrthogonalSeriesAttributeSheetImpl.Lbl.SeriesDataPointComponent" ) ).format( new Object[]{dpc.getType( ).getName( )} ); 
		if ( sContext == null )
		{
			sContext = Messages.getString( "OrthogonalSeriesAttributeSheetImpl.Lbl.SeriesDataPoint" ); 
		}
		FormatSpecifierDialog editor = new FormatSpecifierDialog( cmpContent.getShell( ),
				formatspecifier,
				sContext );
		if ( editor.open( ) == Window.OK )
		{
			if ( editor.getFormatSpecifier( ) == null )
			{
				dpc.eUnset( AttributePackage.eINSTANCE.getDataPointComponent_FormatSpecifier( ) );
				return;
			}
			dpc.setFormatSpecifier( editor.getFormatSpecifier( ) );
		}
	}
	private int getIndexOfListItem( int indexOfListItem )
	{
		return ( (Integer) dataPointIndex.get( indexOfListItem ) ).intValue( );
	}
	private void removeDataPointComponent( int iComponentIndex )
	{
		getSeriesForProcessing( ).getDataPoint( )