I'm currently using version 2018.1.116.40, don't know if this issue was resolved on recent version.
- Add raddropdownList to form(I'm currently adding directly to a user control, inside radpageview, and then to the form) and set it to dropdownlist style
- Set it DisplayMember and ValueMember
- Set a datasource where at least 2 items have the same description.
- Subscribe to SelectedIndexChanged or changing or valueChanged, and on this event show any form with ShowDialog or Focus() on other control.
- Run Project
- Select the second repeated item, wait for dialog or Focus, then check selected item on dropdown, it will always be the first repeated item, if repeat other description like
'TEST1', 'TEST1', 'TEST1',
the selected item will be the first 'TEST1' or the first 'TEST2', and it goes on