Hi R D,
Thank you for posting in the community.
I would need to know how you are trying to access the dropdown control. If you want to hide the WebDropDown you should be able to do that using:
$find("WebDropDown1").set_visible(false)
In order to be able to provide more insight I would need to see your page markup (and relevant jscript).
Best Regards,
Petar IvanovDeveloper Support EngineerInfragistics, Inc.http://es.infragistics.com/support
Please feel free to contact me if you need assistance with this matter.