chow test

Hi everybody,
I've got a problem with Chow Test about structural break...
in fact on the base of my knowledge I think that this test can be used for time series data as cross-section data... but using the software Gretl I find the problem. With cross-section data the software doesn't allow me to do this test... now my question is: there is a problem with the software or with my knowledge? if the problem is the software, someone knows another software that allows to do the chow test??

PS: sorry for my english