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
|| selection instanceof ScalarParameterHandle
				|| selection instanceof ParameterGroupHandle
				
				|| selection instanceof GroupHandle
				|| selection instanceof StyleHandle
				|| selection instanceof ThemeHandle
				|| selection instanceof EmbeddedImageHandle
				|| selection instanceof TemplateElementHandle
				|| selection instanceof DataSetItemModel
				|| selection instanceof ResultSetColumnHandle;
	}
	/**
	 * Gets a copy of source data. If copy multi-selection, skip all children's
	 * clone
	 * 
	 * @param source
	 *            source to clone
	 * @return copy of source
	 */
	public static Object cloneSource( Object source )
	{
		source = unwrapToModel( source );
		if ( source instanceof Object[] )
		{
			Object[] array = (Object[]) source;
			ArrayList list = new ArrayList( );
			for ( int i = 0; i < array.length; i++ )
			{
				if ( array[i] instanceof ColumnHandle )
				{