3d68071b_wiki_treegrid___jqGrid_Wiki__Type
[Option] treeReader [Description] extends the colModel defined in the basic grid. The fields described here are added to end of the colModel array and are hidden. This means that the data returned from the server should have values for these fields. For a full description of all valid values see below. [Type] 
array
b o o l e a n
s t r i n g
m i x e d
a r r a y
n u m e r i c
wiki:treegrid - jqGrid Wiki