Bug 167210 No change in 'TOC Item Expression' after select a group row[0001]
Description: No change in 'TOC Item Expression' after select a group row[0001] Build number: 2.2.0.v20061208-1310 Steps to reproduce: 1, Drag a dataset into layout 2, Select the table and insert a group on it. 3, In New Group, select a row as group row 4, Check the 'TOC Item Expression' Expected result: The row["XXXX"] in 'TOC Item Expression' after selecting 'Group On' Actual result: There is still blank in 'TOC Item Expression' Error log:
UI/org.eclipse.birt.report.designer.ui/src/org/eclipse/birt/report/designer/ui/dialogs/GroupDialog.java
* Get subIntervalChoice, could be String,Date,Numeric or All
	 * 
	 * @return
	 */
	private IChoice[] getSubIntervalChoice( )
	{
		Class columnType = getColumnType( );
		if ( columnType == null )
			return intervalChoicesAll;
		if ( String.class.isAssignableFrom( columnType ) )
		{
			return intervalChoicesString;
		}
		else if ( Date.class.isAssignableFrom( columnType ) )
		{
			return intervalChoicesDate;
		}
		else if ( Number.class.isAssignableFrom( columnType ) )
		{
			return intervalChoicesNumeric;
		}
		else
		{
			return intervalChoicesAll;
		}
	}
	private static IChoice[] getIntervalChoicesString( )
	{
		String[] str = new String[]{
				DesignChoiceConstants.INTERVAL_NONE,