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Using only the provided code snippet I am not exactly sure what is the set-up in your main application. How you have saved and load the combo box? You can elaborate more on your scenario. It will be great if you can send me isolated project from your application reproducing this behavior so I can directly investigate it on my side. This way I could have better look at your set up.
I have created a sample project to test your scenario which used our PersistenceFramework
to save and load the control. The project is attached to this reply. When you run the project select different item from the combo box and pressed the save button. Then close the application and run it again. You can observe that the last selected item is loaded correctly.
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