Testing for heteroskedasticity after xtregar

[Roger Young]

How do I test for heteroskedasticity after xtregar? My code is below:
xtregar gp expansion population percentbach unemp percenthealthemp, re rhotype(theil)

[Carlo Lazzaro]

Roger:
as far as I know, there's no such a test for -xtregar-.
Visually inspection is a possible option, I guess.

[Roger Young]

Thanks.