I have a similar requirement but I need the contents of the select box to be different depending on the record being edited.

I tried calling

jQuery(grid).setColProp('link_to', {editoptions: {value: new_opts}});

before firing

jQuery(grid).editGridRow(…)

However, this only worked for the first call. Subsequent calls for other records would not change it.

I tried editing the SetColProp() function to make the extend a deep copy:

$.extend(true, this.p.colModel,obj);

but this still didn't fix the problem.

Edit: I was able to fix this by adding

recreateForm: true

to

jQuery(grid).editGridRow(…)