Drop down list selection improvements

[jbair06]

Drop down lists need to have better methods for selecting the currently highlighted value. The enter or tab keys should select the currently highlighted value, dismiss the popup, and move to the next component. Currently, it appears to select the value if not selected, and try to submit the form.

The escape key should dismiss the drop down without replacing the user entered text. Then tab or enter should move to the next component.

[jbair06]

In addition, for the auto completion feature of the drop down, pressing the right arrow should fill in the next digit of the suggested selection.

[icoxxx]

Can we consider it done with the fix for #1467?
@jbair06