Custom action bar not working in edittext on HTC sense

Question

I have an app that uses a custom action bar on an EditText window. This works fine on vanilla Jellybean 4.1 and 4.2, but on an HTC One X+ it seems HTC Sense is getting in the way. This is what I see on vanilla JB:

_{(source: sr20.org)}

So I have my custom action bar with style buttons (I, B, U).

And this is what I see on HTC. The action bar has not been replaced with mine, instead there is a Sense version of the copy/paste popup.

_{(source: sr20.org)}

Any ideas on how I can persuade the EditText to behave like the Android API says it should?