Bug 160429 Drag the datasource and dataset and produce an error gradation in data explorer
Details: Drag the datasource and dataset and produce an error gradation in data explorer Step: 1.New 4 datasource named d1, d2, d3, d4. 2.Drag the datasource in data explorer to change the gradation. (1) Drag d1 between d2 and d3. (2) Drag d2 between d3 and d4. (3) Drag d4 between d2 and d3. (4) Drag d4 to the top. (5) Drag d3 between d1 and d2. (6) Drag d3 to the top. Actual result: (1) d1 will be move to bottom. (2) d2 will be move to bottom. (3) d4 will not be move to anywhere. (4) d4 will not be move to anywhere. (5) d3 will be move to bottom. (6) d3 will be move to bottom. Excepted result: The datasource will be move to the correct station.
model/org.eclipse.birt.report.model/src/org/eclipse/birt/report/model/api/ModuleHandle.java
* <tr>
 * <td>Styles</td>
 * <td>User-defined styles used to format elements in the report. Each style
 * must have a unique name within the set of styles for this report.</td>
 * </tr>
 * 
 * <tr>
 * <td>Page Setup</td>
 * <td>The layout of the master pages within the report.</td>
 * </tr>
 * 
 * <tr>
 * <td>Components</td>
 * <td>Reusable report items defined in this design. Report items can extend
 * these items. Defines a "private library" for this design.</td>
 * </tr>
 * 
 * <tr>
 * <td>Translations</td>
 * <td>The list of externalized messages specifically for this report.</td>
 * </tr>
 * 
 * <tr>
 * <td>Images</td>
 * <td>A list of images embedded in this report.</td>
 * </tr>
 * 
 * </table>
 */
public abstract class ModuleHandle extends DesignElementHandle