Bug 313297 XML data set fail in chart data preview
chart/org.eclipse.birt.chart.ui/src/org/eclipse/birt/chart/ui/swt/CustomPreviewTable.java
};
	
	TraverseListener traverseListener = new TraverseListener( ) {
		public void keyTraversed( TraverseEvent e )
		{
			if ( e.character != SWT.TAB )
			{
				e.doit = false;
			}
		}
	}; 
	/**
	 * @param parent
	 * @param style
	 */
	public CustomPreviewTable( Composite parent, int style )
	{
		super( parent, SWT.BORDER );
		fHeadings = new Vector<ColumnBindingInfo>( );
		columnWidths = new Vector<Integer>( );
		btnHeaders = new Vector<Button>( );
		vListeners = new Vector<Listener>( );
		placeComponents( );
		createDummyTable( );
	}
	private void placeComponents( )
	{
		if ( cmpHeaders == null )
		{
			GridLayout glTable = new GridLayout( );