How to Restrict date selection in DatePicker Control

[dsen.25]

Hi,

In my infopath form i have one date picker control.User can select
current month or pervious month only.He can't select other month.How
to do?

I tried on OnValidate event and OnAfterChange event. But i failed.In
both event keep on firing upto 16 times.

Pls Can any tell me how to restrict the date selection from user.

Thanks

Senthil Kumar D