Dropdown list Items

I have a dropdown list that is dynamically populated.

I need to set the height of the dropdown area...when clicked...to x number of items.

Size="10"  shows the ddl expanded and 10 items shown with a scrollbar
ddlCountry.Attributes.Add("Size", "10")  does the same thing

ddlCountry.height=10 maxes the ddl 10 px high...

I need it default height...
When clicked on it has to show 10 items with a scrollbar to see the rest.
Larry Bristersr. DeveloperAsked:
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Bob LearnedCommented:
Try using em units.

The amazing em unit and other best practices
http://www.w3.org/WAI/GL/css2em.htm
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