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
* Sets the resource key of the static description of the module.
	 * 
	 * @param resourceKey
	 *            the resource key of the static description
	 * 
	 * @throws SemanticException
	 *             if the resource key property is locked.
	 */
	public void setDescriptionKey( String resourceKey )
			throws SemanticException
	{
		setStringProperty( Module.DESCRIPTION_ID_PROP, resourceKey );
	}
	/**
	 * Initializes the report design when it is just created.
	 * <p>
	 * Set the value to the properties on repot design element which need the
	 * initialize valuel.
	 * 
	 * All initialize operations will not go into the command stack and can not
	 * be undo redo.
	 * 
	 * @param properties
	 *            the property name value pairs.Those properties in the map are
	 *            which need to be initialized.
	 * @throws SemanticException
	 *             SemamticException will throw out when the give properties map
	 *             contians invlid property name or property value.
	 * @deprecated
	 */