TComboBox.Style = csDropDown problem

Odd behavior when TComboBox.Style = csDropDown. The edit field data is being
cleared when user views dropdown list but clicks off the list - opting to
not select one of the strings. This does not occur under Win2K, but does
under NT and Win98.

To duplicate:
1. create combobox with several strings in the Items property.
2. run application and type keyboard data into the edit field
3. click the dropdown button, move the hilite over one of the options
4. move mouse outside the list and click on the form background

Notice that under Win2K the typed data remains, but under the other OS's the
edit field is blanked.

Is there any work-around for this?