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
cmbComponentTypes.setLayoutData( gdCMBComponentTypes );
		
		lblPrefix = new Label( grpDataPoint, SWT.NONE );
		GridData gdLBLPrefix = new GridData( );
		lblPrefix.setLayoutData( gdLBLPrefix );
		lblPrefix.setText( Messages.getString( "OrthogonalSeriesAttributeSheetImpl.Lbl.Prefix" ) ); 
		txtPrefix = new TextEditorComposite( grpDataPoint, SWT.BORDER
				| SWT.SINGLE );
		GridData gdTXTPrefix = new GridData( GridData.FILL_HORIZONTAL );
		gdTXTPrefix.horizontalSpan = 3;
		txtPrefix.setLayoutData( gdTXTPrefix );
		txtPrefix.addListener( this );
		
		lblSuffix = new Label( grpDataPoint, SWT.NONE );
		GridData gdLBLSuffix = new GridData( );
		lblSuffix.setLayoutData( gdLBLSuffix );
		lblSuffix.setText( Messages.getString( "OrthogonalSeriesAttributeSheetImpl.Lbl.Suffix" ) ); 
		txtSuffix = new TextEditorComposite( grpDataPoint, SWT.BORDER
				| SWT.SINGLE );
		GridData gdTXTSuffix = new GridData( GridData.FILL_HORIZONTAL );
		gdTXTSuffix.horizontalSpan = 3;
		txtSuffix.setLayoutData( gdTXTSuffix );
		txtSuffix.addListener( this );
		
		lblSeparator = new Label( grpDataPoint, SWT.NONE );
		GridData gdLBLSeparator = new GridData( );
		lblSeparator.setLayoutData( gdLBLSeparator );
		lblSeparator.setText( Messages.getString( "OrthogonalSeriesAttributeSheetImpl.Lbl.Separator" ) ); 
		txtSeparator = new TextEditorComposite( grpDataPoint, SWT.BORDER
				| SWT.SINGLE );