Thank you for writing.
You can not add columns in GridViewMultiComboBoxColumn
through designer or Property builder. Although it is possible to access the editor in the CellEditorInitialized
event and add columns and rows with data in it, this approach is not recommended, as the cells will display the value from the first column.
The recommended approach is to have your data predifined in a DataTable and bind the column to this member. As a result, you can use the DisplayMember and ValueMember properties to customize the cells appearance and behavior.
I attached a sample project which demonstrates both ways. If you think that this solution does not solve your issue, please provide me with more detailed explanation about your case and I will do my best to answer you.
Let me know if I can assist you further.
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