Navigate with Tab and Shift+Tab

[MatiasHeffel]

As a developer in Visual Studio, I want to be able to navigate properly through the columns that are editable, so that I can quickly edit workitems. When I Tab or Shift-Tab to a read-only field, it gets in the way of quick editing. In some cases the first time enter in fields that are ReadOnly. (greyOut the background)

Acceptance Criteria

Navigate through all the editable fields for ones story or defect using the Tab key or Shift+Tab

Steps to Test

• Try to edit and check how many editable field has a particular story or defect or task or test
• Use the TAB key or Shift+Tab and verify if pass through all the editable fields

[MatiasHeffel]

I've make some refactor in the code and change the value of the index that is used to go through all the editable fields and also re-evaluate the property Read only for the field.