Required library edition:
Required library file: dhtmlxgrid_ssc.js

load open state of TreeGrid in cookie

• name - optional, cookie name

   mygrid.load("grid.xml",function(){
      //minimal parameters set
      mygrid.loadOpenStates();
      //maximal parameters set
      mygrid.loadOpenStates("some_name");
   })

See also: saveOpenStates