With the DropDownList I have found that if the dataTextfield and the dataValueField are the same field name, then the optionLabel value is not displayed.
I created a jsfiddle to demonstrate: http://jsfiddle.net/gxclarke/v9wjM/4/
Regards,
Gary
I created a jsfiddle to demonstrate: http://jsfiddle.net/gxclarke/v9wjM/4/
Regards,
Gary