Bug 312859 The list of operator for Chart filter does not provide 30 visible items
chart/org.eclipse.birt.chart.reportitem.ui/src/org/eclipse/birt/chart/reportitem/ui/dialogs/ChartCubeFilterConditionBuilder.java
public ChartCubeFilterConditionBuilder( String title, String message )
	{
		this( UIUtil.getDefaultShell( ), title, message );
	}
	
	/**
	 * @param parentShell
	 * @param title
	 */
	public ChartCubeFilterConditionBuilder( Shell parentShell, String title,
			String message )
	{
		super( parentShell );
		this.title = title;
		this.message = message;
	}
	
	private void setContext( ChartWizardContext context )
	{
		this.context = context;
	}
	
	protected synchronized DataRequestSession getDteSession( )
	{
		if ( session == null )
		{
			try
			{
				session = DataRequestSession.newSession( new DataSessionContext( DataSessionContext.MODE_DIRECT_PRESENTATION ) );
			}