Bug 136833 Group key is affected by Generate All button in group.
Description: Group key is affected by Generate All button in group. Steps to reproduce: 1. Insert a list 2. Add a group, select a group key, then click Generate All button. Actual result: Group key disappeared, you have to reset it.
UI/org.eclipse.birt.report.designer.ui/src/org/eclipse/birt/report/designer/ui/dialogs/GroupDialog.java
* Creates the field area
	 * 
	 * @param parent
	 *            the parent composite
	 */
	private void createFieldArea( 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( GROUP_DLG_GROUP_NAME_LABEL );
		
		nameEditor = new Text( composite, SWT.SINGLE | SWT.BORDER );
		nameEditor.setLayoutData( new GridData( GridData.FILL_HORIZONTAL ) );
		
		new Label( composite, SWT.NONE ).setText( GROUP_DLG_GROUP_KEY_LABEL );
		
		Composite keyArea = new Composite( composite, SWT.NONE );
		keyArea.setLayoutData( new GridData( GridData.FILL_HORIZONTAL ) );
		keyArea.setLayout( UIUtil.createGridLayoutWithoutMargin( 2, false ) );
		keyChooser = new Combo( keyArea, SWT.DROP_DOWN );
		keyChooser.setLayoutData( new GridData( GridData.FILL_HORIZONTAL ) );
		keyChooser.addModifyListener( new ModifyListener( ) {
			public void modifyText( ModifyEvent e )
			{
				if ( !keyChooser.getText( ).trim( ).equals( "" ) ) 
					resetInterval( );