title: How to require ComboBox selection?
body: <p>Working in Windows Forms (C#), creating a Wizard, I'd like to require the user to select an option in a combobox before being allowed to click "Next" to the next page in the form.</p>
  
  <p>I thought I saw where to do this in the past, but I cannot find anything now.</p>
  
  <p>Thx for any help...!</p>
  
  <p>J</p>