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
if ( handle instanceof TableHandle )
			{
				return ( (TableHandle) handle );
			}
			if ( handle instanceof GridHandle )
			{
				return ( (GridHandle) handle );
			}
			handle = handle.getContainer( );
		}
		return null;
	}
	/**
	 * Returns if all objects are in the same column
	 * 
	 * @param objs
	 *            the array of the object
	 */
	public static boolean isInSameColumn( Object[] objs )
	{
		assert objs != null && objs.length > 1;
		final class ColumnPosition
		{
			int columnNumber;
			Object parent;
			ColumnPosition( Object obj )
			{
				if ( obj instanceof ColumnHandle )
				{
					ColumnHandleAdapter columnAdapter = HandleAdapterFactory.getInstance( )