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
/**
	 * Pastes table or grid columns to target
	 * 
	 * @param transferData
	 *            column data
	 * @param targetObj
	 *            table
	 * @param isNew
	 *            true: insert and paste; false: override and paste
	 * @return paste succeed or fail
	 */
	protected static boolean copyColumn( ColumnBandData transferData,
			Object targetObj, boolean isNew )
	{
		try
		{
			int columnNumber = HandleAdapterFactory.getInstance( )
					.getColumnHandleAdapter( targetObj )
					.getColumnNumber( );
			Object parent = ( (ColumnHandle) targetObj ).getContainer( );
			if ( parent instanceof TableHandle )
			{
				if ( isNew )
				{
					( (TableHandle) parent ).insertAndPasteColumn( transferData.copy( ),
							columnNumber );
				}
				else
				{
					( (TableHandle) parent ).pasteColumn( transferData.copy( ),