Hi Falk,
I could see that If the value 12 is not within the MCCBc value,then field goes blank and no value is displayed that time.I am sorry,I could not reproduce the part that says "the SelectedIndex is switched to 0".Also,could you make it clear what exactly you would like to display if the value is already removed from list?
I have attached a sample that shows a comparison between .net ComboBox and our MultiColumnComboBox.I have done this with our latest version 4.1.Please let me know if you are able to reproduce your issue with this sample
If so, it would be appreciable if you can modify this and send it back for furthur investigation.
Sample
Thank you for choosing Syncfusion.
Regards,
Anu.