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
* 
	 * @param parentShell
	 */
	public GroupDialog( Shell parentShell, String title )
	{
		super( parentShell, title );
	}
	/*
	 * (non-Javadoc)
	 * 
	 * @see org.eclipse.jface.dialogs.Dialog#createDialogArea(org.eclipse.swt.widgets.Composite)
	 */
	protected Control createDialogArea( Composite parent )
	{
		
		Composite topComposite = (Composite) super.createDialogArea( parent );
		createTitleArea( topComposite );
		Composite composite = new Composite( topComposite, SWT.NONE );
		composite.setLayoutData( new GridData( GridData.FILL_HORIZONTAL ) );
		composite.setLayout( new GridLayout( 2, true ) );
		createFieldArea( composite );
		createGroupArea( composite );
		createTOCArea( composite );
		createFilterSortingArea( topComposite );
		UIUtil.bindHelp( parent, IHelpContextIds.GROUP_DIALOG_ID );
		return topComposite;
	}
	private void createTOCArea( Composite parent )
	{
		Composite composite = new Composite( parent, SWT.NONE );