Though not sure, still I guess all the values in a dropdown are pre-existing or if we use dynamic properties to update the dropdown we can know atleast what could be it's length.May be that's the reason expand options are not available.
But if you want to expand it you can do so a bit of scripting.
When we select something from the dropdown through change event we can get the vairable length. If the variable/item length is greater than a particular value then we can expand the dropdown.
In the change event of the dropdown :
if(Len($event.change)) > 10
this.w = "10inch";
Thanks for ur reply.
May be u r right about the expand to fit option for ddl.
Your code works fine with the field width to expand, but if we try to do the same with the height the field gets expanded height wise but the data does not wrap around.
I am trying to achive this by hiding the text field and ddl one behind the other.
Thanks a lot once again.