keep the dropdown list open

Hi,.
when starting to press any key, the dropdown list opens if it find something.
but is there a way to keep the DropDown list opned until i actually select something - forcing the user to select something?
what i mean is if we can disable closing the list when we click anywhere else outside the list?
Thanks
when starting to press any key, the dropdown list opens if it find something.
but is there a way to keep the DropDown list opned until i actually select something - forcing the user to select something?
what i mean is if we can disable closing the list when we click anywhere else outside the list?
Thanks