Combo SelectedIndex changed not fired when it is databound

[Shravan]

Hi,
When a combo is databound, the selectedindex before
databinding is -1, after datbinding and painting them the
selectedindex is 0, but the change in the selectedindex is
not raising selectedindexch anged event. Can anybody help
how can we catch the selectedindex change in this time.

Thanks in Advance,
Shravan.