Bug 121287 Post BIRT M3 build: Edit Group Dialog does not present expression builder for Group On
In Edit Group dialog, there is no expression builder for the Group On field. In order to support multi-pass aggregation, the expression builder is needed to specify an expression to group on.
UI/org.eclipse.birt.report.designer.ui/src/org/eclipse/birt/report/designer/ui/dialogs/GroupDialog.java
/*******************************************************************************
 * Copyright (c) 2004 Actuate Corporation.
 * All rights reserved. This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License v1.0
 * which accompanies this distribution, and is available at
 * http://www.eclipse.org/legal/epl-v10.html
 *
 * Contributors:
 *  Actuate Corporation  - initial API and implementation
 *******************************************************************************/
package org.eclipse.birt.report.designer.ui.dialogs;
import java.util.ArrayList;
import java.util.Iterator;
import java.util.List;
import org.eclipse.birt.report.designer.core.model.views.data.DataSetItemModel;
import org.eclipse.birt.report.designer.internal.ui.dialogs.BaseDialog;
import org.eclipse.birt.report.designer.internal.ui.dnd.InsertInLayoutUtil;
import org.eclipse.birt.report.designer.internal.ui.util.DataSetManager;
import org.eclipse.birt.report.designer.internal.ui.util.ExceptionHandler;
import org.eclipse.birt.report.designer.internal.ui.util.UIUtil;
import org.eclipse.birt.report.designer.internal.ui.views.attributes.page.FilterHandleProvider;
import org.eclipse.birt.report.designer.internal.ui.views.attributes.page.FormPage;
import org.eclipse.birt.report.designer.internal.ui.views.attributes.page.SortingHandleProvider;
import org.eclipse.birt.report.designer.internal.ui.views.attributes.widget.Spinner;