Bug 200312 Chart Variables are still in the bottom right pane when select other categories [13]
UI/org.eclipse.birt.report.designer.ui/src/org/eclipse/birt/report/designer/ui/dialogs/ExpressionBuilder.java
{
	private static final String DIALOG_TITLE = Messages.getString( "ExpressionBuidler.Dialog.Title" ); 
	private static final String PROMRT_MESSAGE = Messages.getString( "ExpressionBuilder.Message.Prompt" ); 
	private static final String LABEL_FUNCTIONS = Messages.getString( "ExpressionBuilder.Label.Functions" ); 
	private static final String LABEL_SUB_CATEGORY = Messages.getString( "ExpressionBuilder.Label.SubCategory" ); 
	private static final String LABEL_CATEGORY = Messages.getString( "ExpressionBuilder.Label.Category" ); 
	private static final String LABEL_OPERATORS = Messages.getString( "ExpressionBuilder.Label.Operators" ); 
	private static final String TOOL_TIP_TEXT_REDO = Messages.getString( "TextEditDialog.toolTipText.redo" ); 
	private static final String TOOL_TIP_TEXT_UNDO = Messages.getString( "TextEditDialog.toolTipText.undo" ); 
	private static final String TOOL_TIP_TEXT_DELETE = Messages.getString( "TextEditDialog.toolTipText.delete" ); 
	private static final String TOOL_TIP_TEXT_PASTE = Messages.getString( "TextEditDialog.toolTipText.paste" ); 
	private static final String TOOL_TIP_TEXT_CUT = Messages.getString( "TextEditDialog.toolTipText.cut" ); 
	private static final String TOOL_TIP_TEXT_COPY = Messages.getString( "TextEditDialog.toolTipText.copy" ); 
	private class TableContentProvider implements IStructuredContentProvider
	{
		private Viewer viewer;
		private final Object[] EMPTY = new Object[0];
		public TableContentProvider( Viewer viewer )
		{
			this.viewer = viewer;
		}
		public Object[] getElements( Object inputElement )
		{
			if ( viewer == categoryTable )
			{
				return provider.getCategory( );
			}