Thank you for your question, Bhasker.
As you have noticed, our WinForms combobox does not support multi-column support yet. This is due to the fact that our WinForms suite is rather young, especially when compared to our ASP.NET suite - the first official WinForms release
was about year and a half ago (October 2006).
Multi-column support is on our top-priority list as this is the only major feature that is left for the product. We hope to be able to provide it as soon as Q1 2008 in April. This feature depends on several important improvements we are planning for RadComboBox which should be implemented beforehand. For example, we plan on moving RadListBox to the new layouts which we have been working on, which will improve performance and will allow adding multi-column support easily. We plan to finalize the first phase of combo's improvements by the end of January. Only afterwards we will be able to say when exactly multi-column support will appear. As I said, our hopes are high that we will be able to provide it as soon as April. I am afraid that I cannot promise it for earlier than April.
As soon as we have more information on the April release we will update the WinForms Roadmap
. I will try to follow up here with more information on our combobox plans in early February.
the Telerik team