Nested Combobox in C#

Hi Friends,

Is it possible to have combobox inside of a combobox in C# Desktop application?

Ex:
Combo 1st containing State names, and if i choose Tamilnadu from that it needs to show district of TN.

I don't want 2 separate Combobox, i need it like a sub menu.
Give me some ideas.

Thanks in advance

Best Regards,
Murugesan P