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Expanding is going wrong

I am using the open="1" attribute to open a row but it is not working on a sublevel.

ROOT
Level 1
Level 2 --> I want this one to open, but is doesn't.

Preview XML.

<rows>
- <row selected="1" id="map_0" open="1">
<cell image="folder.gif">Archiefdocumenten2</cell>
<cell>31-03-2009</cell>
<cell />
- <row id="map_361">
<cell image="folder.gif"><a href="/archief/documenten/bewerkmap/map-361.htm">Test map WDT</a></cell>
<cell>03-02-2009</cell>
<cell>Kevin van der Laak</cell>
- <row id="map_362" open="1">
<cell image="folder.gif"><a href="/archief/documenten/bewerkmap/map-362.htm">Test submap WDT</a></cell>
<cell>03-02-2009</cell>
<cell>Kevin van der Laak</cell>
- <row id="doc_297">
<cell><a href="/archief/documenten/detail/bestand-297.htm">20090203_huis_ideeen.doc</a></cell>
<cell>03-02-2009</cell>
<cell>Kevin van der Laak</cell>
</row>
- <row id="doc_413">
<cell><a href="/archief/documenten/detail/bestand-413.htm">20090331_briefpapier.pdf</a></cell>
<cell>31-03-2009</cell>
<cell>Kevin van der Laak</cell>
</row>
</row>
+ <row id="doc_296">
<cell><a href="/archief/documenten/detail/bestand-296.htm">20090203_poster_b2.txt</a></cell>
<cell>03-02-2009</cell>
<cell>Kevin van der Laak</cell>
</row>
</row>

Are you mean treegrid or sub-rows|sub-grids functionality?, "open" attribute supported by treegrid only. 

Also, beware that if you have such structure as 

<rows>
   <row id="some1">
         <row id="some2" open="1">
                 <row id="some3">

In result you will have branch "some2" opened, but because its parent closed - it will not be visible after loading. To work as expected both branches "some1" and "some2" must have "open" in XML

So it must look as
<row selected="1" id="map_0" open="1"> 
<cell image="folder.gif">Archiefdocumenten2</cell> 
<cell>31-03-2009</cell> 
<cell /> 
    <row id="map_361" open="1"> 
    <cell image="folder.gif"><a href="/archief/documenten/bewerkmap/map-361.htm">Test map WDT</a></cell> 
    <cell>03-02-2009</cell> 
    <cell>Kevin van der Laak</cell> 
        <row id="map_362" open="1"> 


If such way  of marking can't be achieved in your case , it possible to extend existing functionality through API and events, please inform if you need more details about such modification.