Need to be able to Tab into a combo box using the code I already have

I found a great way to automatically fill in a value by starting to type it, but to get into the combo box I have to double click the cell with a drop down list, what I would like to do is to Tab into the cell(combo Box) as well as double click, I already have a way to tab out of the combo box, and that works great, I just don't know how to get into the combo box, I am including a copy of the file. "Que", "Type", and "Completion Status" all have a drop down list, I need to be able to tab into "Que" then "Type" then "Completion Status", enter the beginning of the value I want, which should autofill, then tab to the next one, any help would be appreciated, thanks

the code I have used comes from: http://www.contextures.com/xlDataVal11.html