>>BTW, your sample form does not work correctly either. Say, you have right now Level2 and Section 6 (for example). You change the level to something that doesn't include this section, but the section doesn't change.
>
>Just put:
>thisform.Refresh() in InteractiveChange event of the Level combo.

I think I have a bigger poblem in my case. I didn't want to re-build the grid, so I'm trying this code:

 =tablerevert(.t.,'rsTSBlocks') && Everything we wanted to save should be already saved
      =cursorsetprop('Buffering', 3,'rsTSBlocks')
      private nTemplateID, nBlockCount
      nBlockCount = 0
      nTemplateID = thisform.oCurrentNode.values("TemplateID").value
      =mySQLExec("execute dbo.siriussp_rsGetBlocks @TemplateID = ?m.nTemplateID, @BlocksCount = ?@nBlockCount OUTPUT" , 'rsTSBlocksTemp',program())

      zap in rsTSBlocks
      =cursorsetprop('Buffering', 5,'rsTSBlocks')
     
       make_view_updatable('rsTSBlocks',5)	    
      insert into rsTSBlocks ;
         select * from rsTSBlocksTemp     
     
      use in select('rsTSBlocksTemp')
      select rsTSBlocks
      llReturn = thisform.SetBlocksPage(m.nBlockCount)

Unfortunately, this whole idea is wrong and not going to work. The problem is that the records are going to be treated as newly inserted.

I think I need to try resetting record source to '' and then setting it again instead.