Hello,
I modified your sample to use my app's combobox properties, and added a second button and method to set the datasource.
This behaves as my original did. When you click a button for the first time, the combobox populates correctly. However, clicking on the other button leaves just the 'None' entry and none of the sports listed. To replicate this behavior:
Click first Refresh button - note that dropdown is correct
Click second Refresh button - note that only "None" is in dropdown
Click first Refresh button - note that only "None" is in dropdown
Thanks,
Lee
Attachment:
Sample_bed260f9.zip