Attach my own autosuggest to open input box in xGrid

We have our own autosuggest method that we use on other text inputs throughout our site; it uses an older version of (devbridge.com/projects/autocomplete/jquery/). Is it possible to attach this to the open input box in the xGrid, and if so how do I find the open input?

Unfortunately you will have to create your own exCell type with needed behaviour.
A tutorial you can find here:
http://docs.dhtmlx.com/doku.php?id=dhtmlxgrid:toc_custom_excell_creation

Also you may have a look at the native similar functionality:
http://www.dhtmlx.com/docs/products/dhtmlxGrid/samples/13_interaction_other_components/01_pro_combo.html