jQuery Grid Plugin - jqGrid

 Say I have a simple hierarchy of XML like…

<root>

            <item label="Parent1″ level="0″ leaf="false" parent="" id="Parent1″>

                      <item label="Child1″ level="1″ leaf="true" parent="Parent1″ id="Parent1/Child1″>

                      <item label="Child2″ level="1″ leaf="true" parent="Parent1″ id="Parent1/Child2″>

            </item>

            <item label="Parent2″ level="0″ leaf="false" parent="" id="Parent2″>

                     <item label="Child1″ level="1″ leaf="true" parent="Parent2″ id="Parent2/Child1″>

            </item>

</root>

And my treegrid is setup something like this…

var colNames = ['Label'];
var colModel = [ {name:'label', xmlmap: function (obj) { return $(obj).attr("label");}} ];

$("#myTreeGrid").jqGrid({

treeGrid: true,
treeGridModel: 'adjancency',
ExpandColClick: true,
ExpandColumn: 'Label',
datatype: 'xmlstring',
datastr: myXML,
colNames: colNames,
colModel: colModel,
xmlReader: {
                      root: "root", 
                      row: "item", 
                      repeatitems: false
},
treeReader: {
                      level_field: "[level]",
                      parent_id_field: "[parent]",
                      leaf_field: "[leaf]",
                      expanded_field: "[expanded]"
},
gridview: false,
caption: 'My Tree Sample',

});

Now this XML is a bit different than the single example that google is giving me. I was hoping this would work due to the little xmlmap trick being able to pull out attributes via the function call ie xmlmap: function (obj) { return $(obj).attr("label");} that I'm using in the colModel and being able to use attributes in the treeReader and that all seems to work well but the one thing that I can't get to work for the life of me is being able to expand/collapse the parent.

I'm getting what looks like parent and children in the tree(they've got the right icons) but they don't seem to be connected. Children are starting off fully expanded even though their expand field is set to false and clicking on the parent's expand/collapse triangle just seems to stick to expand regardless of what the field was set to.

I'm guessing I'm missing a field in my treeReader for id to connect parent and children but all I can find in the documentation available is level_field, parent_id_field, leaf_field, and expanded_field for the adjancency model. I've also tried setting the id field in the xmlReader but haven't had any luck.

Could it also be that I'm missing a field for setting the loaded boolean? I know in the standard XML treegrid example, it's recommended that the last tag for each row be set to true(I think) to keep treegrid from contacting the server for the children's contents. Could it be that my parent expand is stuck because its trying to pull more data from the server even though I don't want it to?

Does anyone have any suggestions? I feel like I'm so close to getting this to work and I'm getting tripped up on something I'm just not finding.

Also, the links that I'm guessing explain what the nested and adjancency models really mean seem to be broken. Does anyone have a simple explanation for the difference between the two? Judging from the differences in their treeReaders, they seem a bit backwards to me. Wouldn't adjacent mean things are side by side which would use the left/right fields?

And kind of a side comment that I hope doesn't come off as snarky It's kind of a bummer to me that I've got a very hierarchical XML but I still have to go thru and explicitly setup parent/child relationships via either tags or attributes.

Thanks for any advice you can drop on me!