Defining a non-empty
optionLabel breaks keyboard navigation when ARIA or JAWS is used.
See the example at http://dojo.telerik.com/@richm/OLumO. Using Chrome and ARIA, I focus the dropdown and press Alt-DownArrow to open the list. Pressing down arrow again should begin to navigate within the list, but instead ARIA announces "blank" and further down arrow keypresses seems to move navigator seems to move around the HTML document and the dropdown closes. JAWS behaves similarly.
This does not occur if ARIA or JAWS is not running.
Any help appreciated - thanks.