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
private transient Map mapDataPointNames;
	/**
	 * Caches corresponding index in model of each List item
	 */
	private transient ArrayList dataPointIndex;
	public SeriesLabelSheet( String title, ChartWizardContext context,
			SeriesDefinition seriesDefn )
	{
		super( title, context, true );
		this.seriesDefn = seriesDefn;
		this.context = context;
		mapDataPointNames = new HashMap( );
		dataPointIndex = new ArrayList( );
	}
	/*
	 * (non-Javadoc)
	 * 
	 * @see org.eclipse.birt.chart.ui.swt.ISheet#getComponent(org.eclipse.swt.widgets.Composite)
	 */
	public Composite getComponent( Composite parent )
	{
		ChartUIUtil.bindHelp( parent, ChartHelpContextIds.POPUP_SERIES_LABEL );
		cmpContent = new Composite( parent, SWT.NONE );
		{
			
			GridLayout glContent = new GridLayout( );
			glContent.numColumns = 2;
			cmpContent.setLayout( glContent );
		}
		Composite cmpTop = new Composite( cmpContent, SWT.NONE );