Bug 167542 A parameter group isn't deleted after moving it to another parameter group through DND
Drag a parameter group and drop it to another one is a "move" operation, which cuts the source and pastes to the destination. But the source one isn't deleted in such operation while the parameters in the group are all deleted.
UI/org.eclipse.birt.report.designer.core/src/org/eclipse/birt/report/designer/util/DNDUtil.java
*            the new container
	 * @param position
	 *            the position will be added
	 * @return command
	 */
	protected static Command getNewCommand( String commandType,
			Object transferSource, Object newContainer, int position )
	{
		boolean isCut = TYPE_CUT.equals( commandType );
		if ( newContainer instanceof ParameterGroupHandle
				&& ( transferSource instanceof ParameterGroupHandle || DEUtil.isParameterGroup( transferSource ) ) )
		{
			return pasteParameterGroup( commandType,
					transferSource,
					(ParameterGroupHandle) newContainer );
		}
		else if ( transferSource instanceof DesignElementHandle )
		{
			return new PasteCommand( (DesignElementHandle) transferSource,
					newContainer,
					position,
					isCut );
		}
		else if ( transferSource instanceof IDesignElement )
		{
			return new PasteCommand( (IDesignElement) transferSource,
					newContainer,
					position );
		}
		return null;