This looks really odd to me:
<my:SubmitStatus my:SubmitStatus="0">0</my:SubmitStatus>
Do you have a copy/paste error? Or does SubmitStatus actually also have an attribute named "SubmitStatus"?
At any rate, is the condition on your button to hide / disable it if SubmitStatus = 1?
It looks like, if your rule on submit was supposed to set that field to 1, that isn't happening, as it is currently 0, right?