With the following code the combobox cbAdditionalFields is not holding the selected value in SelectedItem property. How to get the selected item property of the combobox? and on selection changed not focus

```
var userFields = recordType.UserFields.Where(u => u.Format == UserFieldFormats.String);

cbAdditionalFields.DataSource = userFields.ToList();
cbAdditionalFields.DisplayMember = "Name";

```