Hello,

You have hidden:true and and edithidden ; false – this field at all is not present in the grid form.

Moreover hidden fields are not posted to the server.

I sugest you a very simple approach – set the field as hidden – in edit rules set it as edithidden to true.

In beforeShowForm event hide the filed like this

$(“#tr_CountryID).hide();

Look at documentationn what for id are builded automatically in the form.

Regards