Bug 120068 TOC Item Expression is added automatically when adding the group key
Description: TOC Item Expression is added automatically when adding the group key Steps to reproduce: 1.Add a table binding with the dataset 2.Choose the table, add a group(say goupkey:row["CUSTOMERNUMBER"]) 3.Click "group" to invoke "Edit Group" dialog Expected result: Nothing in TOC Item Expression Actual result: The group key (row["CUSTOMERNUMBER"]) is added to the TOC Item Expression
UI/org.eclipse.birt.report.designer.ui/src/org/eclipse/birt/report/designer/ui/dialogs/GroupDialog.java
private static final String GROUP_DLG_GROUP_RANGE_LABEL = Messages.getString( "GroupDialog.Label.Range" ); 
	private static final String GROUP_DLG_GROUP_INTERVAL_LABEL = Messages.getString( "GroupDialog.Label.Interval" ); 
	private static final String GROUP_DLG_GROUP_KEY_LABEL = Messages.getString( "GroupDialog.Label.GroupOn" ); 
	private static final String GROUP_DLG_GROUP_NAME_LABEL = Messages.getString( "GroupDialog.Label.Name" ); 
	private static final String TAB_SORTING = Messages.getString( "GroupDialog.Tab.Sorting" ); 
	private static final String TAB_FILTER = Messages.getString( "GroupDialog.Tab.Filter" ); 
	private static final String GROUP_DLG_INCLUDE_FOOTER_LABEL = Messages.getString( "GroupDialog.Label.IncludeFooter" ); 
	private static final String GROUP_DLG_INCLUDE_HEADER_LABEL = Messages.getString( "GroupDialog.Label.IncludeHeader" ); 
	private static final String GROUP_DLG_HEADER_FOOTER_LABEL = Messages.getString( "GroupDialog.Label.HeaderFooter" ); 
	private static final String GROUP_DLG_AREA_MSG = Messages.getString( "GroupDialog.Dialog.GroupDetail" ); 
	private static final String ERROR_DLG_TITLE_NO_DATA = Messages.getString( "GroupDialog.DialogTitle.NoData" ); 
	private static final String ERROR_MESSAGE_NO_DATA = Messages.getString( "GroupDialog.ErrorMessage.NoData" ); 
	public static final String GROUP_DLG_TITLE_NEW = Messages.getString( "GroupDialog.Title.New" ); 
	
	public static final String GROUP_DLG_TITLE_EDIT = Messages.getString( "GroupDialog.Title.Edit" ); 
	private List dataSetList = null, columnList;
	private GroupHandle inputGroup;
	/**
	 * The name editor
	 */
	private Text nameEditor;
	/**
	 * The group key and interval type combo box.
	 */
	private Combo keyChooser, intervalType;
	/**
	 * The spinner to choose interval range;
	 */
	private Spinner intervalRange;
	private FormPage filterPage, sortPage;