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
pagebreakBeforeCombo = new Combo( pagebreakGroup, SWT.NONE );
		for ( int i = 0; i < pagebreakBeforeChoicesAll.length; i++ )
		{
			pagebreakBeforeCombo.add( pagebreakBeforeChoicesAll[i].getDisplayName( ) );
		}
		pagebreakBeforeCombo.setData( pagebreakBeforeChoicesAll );
		new Label( pagebreakGroup, SWT.NONE ).setText( Messages.getString( "GroupDialog.PageBreakAfter" ) ); 
		pagebreakAfterCombo = new Combo( pagebreakGroup, SWT.NONE );
		for ( int i = 0; i < pagebreakAfterChoicesAll.length; i++ )
		{
			pagebreakAfterCombo.add( pagebreakAfterChoicesAll[i].getDisplayName( ) );
		}
		pagebreakAfterCombo.setData( pagebreakAfterChoicesAll );
		repeatHeaderButton = new Button( pagebreakGroup, SWT.CHECK );
		repeatHeaderButton.setText( Messages.getString( "GroupDialog.RepeatHeader" ) ); 
		GridData data = new GridData( );
		data.horizontalSpan = 2;
		repeatHeaderButton.setLayoutData( data );
	}
	/**
	 * Creates sorting and filter table area
	 * 
	 * @param parent
	 *            the parent composite
	 */
	private void createFilterSortingArea( Composite parent )
	{
		Group group = new Group( parent, SWT.NONE );
		group.setText( GROUP_DLG_GROUP_FILTER_SORTING );
		group.setLayout( new GridLayout( ) );