how to relate binded comboboxes in grid

[David]

Hi,
I have 3 tables named
1-country(countryid,name)
2-state(stateid,countryid,name)
3-city(cityid,countryid,stateid,name)

and the table named address which have(countryid,stateid,cityid,street) 
All 3 above tables are binded to grid as a combobox column.and address table binded as datasource to the grid everything is fine BUT
how can I relate first 3 combobox together when user select its country from first combo then state combo populate its related states automatically?

[Paul]

Hi Fran,

We have a KB (knowledge base) article regarding the case you are asking about. Feel free to go and check out the information from this link:
http://www.telerik.com/support/kb/winforms/gridview/cascading-comboboxes-in-radgridview.aspx

I hope this helps.

All the best,
Nikolay Aleksiev
the Telerik team