Commenting on a Post without Logging in

I tried to comment on a post without logging in.. i typed a paragraph, once i clicked on the Post Comment button, it redirected me to the login screen  nicely. After logging in, i could not see my paragraph of comment typed, i lost all.

I am expecting [Most of the Mindcraker's] that, once i click on Post Comment button, it should redirect to login page, after logged in, my comments typed should be there in the comment box or it should be posted. 

But none of them are happening... :(..

I dont know i am on right track, if I am wrong, just ignore this. 

Thanks,

Jaganathan B.