Bug 116180 [SPM]Dataset can not be previewed in report designer on Mac
Description: Pull a dataset into the layout, preview in designer there is anothing displayed. Steps: 1, Create a sample datasource. create a dataset with sql statement "select * from CLASSICMODELS.EMPLOYEES" 2, Pull the dataset to the layout of the designer. 3, Preview, there is nothing displayed.
UI/org.eclipse.birt.report.designer.ui/src/org/eclipse/birt/report/designer/internal/ui/dnd/DesignElementDragAdapter.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.internal.ui.dnd;
import org.eclipse.birt.report.designer.internal.ui.util.Policy;
import org.eclipse.birt.report.model.api.ThemeHandle;
import org.eclipse.gef.dnd.TemplateTransfer;
import org.eclipse.jface.viewers.IStructuredSelection;
import org.eclipse.jface.viewers.StructuredViewer;
import org.eclipse.swt.dnd.DragSourceAdapter;
import org.eclipse.swt.dnd.DragSourceEvent;
/**
 * Supports dragging elements in outline view.
 */
public abstract class DesignElementDragAdapter extends DragSourceAdapter
{
	private StructuredViewer viewer;
	/**