Bug 123174 inappropriate column header when inserting a table group
steps to reproduce: - create a table, bind it to an existing data set - insert a table group, e.g. row["CUSTOMERNUMBER"] - drag some data into table detail row - preview report expected behavior: - the column header should be the name of the column actual behavior: - the column header was expr. row["CUSTOMERNUMBER"]
UI/org.eclipse.birt.report.designer.ui/src/org/eclipse/birt/report/designer/ui/dialogs/GroupDialog.java
* (non-Javadoc)
	 * 
	 * @see org.eclipse.jface.dialogs.Dialog#createDialogArea(org.eclipse.swt.widgets.Composite)
	 */
	protected Control createDialogArea( Composite parent )
	{
		Assert.isNotNull( dataSetList );
		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 );
		return topComposite;
	}
	private void createTOCArea( Composite parent )
	{
		Composite composite = new Composite( parent, SWT.NONE );
		composite.setLayout( new GridLayout( ) );
		GridData gd = new GridData( GridData.FILL_BOTH );
		gd.widthHint = 200;
		composite.setLayoutData( gd );
		
		new Label( composite, SWT.NONE ).setText( Messages.getString( "GroupDialog.Dialog.TOC" ) ); 
		
		Composite tocArea = new Composite( composite, SWT.NONE );
		tocArea.setLayoutData( new GridData( GridData.FILL_HORIZONTAL ) );