>>>textbox - txt
>>>
>>>option group
>>>
>>>opg
>>>
>>>checkbox
>>>
>>>chk
>>>
>>>etc.
>>
>>dtp is probably not so bad.
>
>I discussed this problem with others and went with 'cnt' since it was container based class anyway.

Well, it's your decision, so no problem. The reason I would made a different decision is one should always prefer the specific to the general. Lots of things of containers (grids, for example). A Date Picker is a very specific type of container. Heck, you could name every GUI element a Control if you wanted to ;-)