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grid combo

hiii
I am using Dhtmlx Grid with column as combo(coro) Now i want to filter the two values of combo
Example :-

if in the first combo I select the country name such as india in the second combo I want the places of india such as
(Delhi,Bombay,Goa,Banglore) and
I select the country name such as Pakistan in the second combo I want the places of india such as
(karachi,lahore,peshawor)
We call that cascading dropdown in ajax
how can we use such cascading drop down in dhtmlx
Please send me the example I will be really thankful to you all

Please check 
http://dhtmlx.com/docs/products/dhtmlxCombo/samples/initialization/combo_groups.html?un=1244115486000

Full source code of sample included in combo's package.