Fix hidden dialog when called from Bootstrap modal.

Dialog would appear underneath Bootstrap modals if they were being used as a form.
![screen shot 2014-03-14 at 8 35 48 pm](https://f.cloud.github.com/assets/4166438/2427367/3183dde0-abe2-11e3-8a0a-149febcecb2a.png)
![screen shot 2014-03-14 at 8 34 10 pm](https://f.cloud.github.com/assets/4166438/2427368/3189388a-abe2-11e3-91f4-65bd39ade535.png)