I do the following to get a json response:

   url: '/Service1.svc/GetEenBoek?str=hallo',
   method: 'GET',
   success: function(response) {
      var data = Ext.decode(response.responseText);
               //How to get data in my form?
Al works fine and I get valid Json return. After Ext.decode the values are stored in data.
How do I then get those values from data to show up in my form.
My form has a data model, but I cant seem to figure out how to load the data from the data variable to my datamodel.

Thanks in advance...