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
{
		return getStringProperty( HELP_GUIDE_PROP );
	}
	/**
	 * Returns the script called when the report starts executing.
	 * 
	 * @return the script called when the report starts executing
	 */
	public String getInitialize( )
	{
		return getStringProperty( INITIALIZE_METHOD );
	}
	/**
	 * Returns a slot handle to work with the master pages within the report.
	 * Note that the order of the master pages within the slot is unimportant.
	 * 
	 * @return A handle for working with the master pages.
	 */
	public SlotHandle getMasterPages( )
	{
		return getSlot( PAGE_SLOT );
	}
	/**
	 * Finds user-defined messages for the current thread's locale.
	 * 
	 * @param resourceKey
	 *            Resource key of the user-defined message.
	 * @return the corresponding locale-dependent messages. Return
	 *         <code>null</code> if resoueceKey is blank.
	 * @see #getMessage(String, Locale)