Bootstrap 2 modal window content is floating outside of the modal

I'm using bootstrap 2 and Angular-JS to design client side in my web application. I'm using Modal - pop up. In this modal items are added in a list (ng-repeat) and at the bottom of this window There is a button to save edits or cancel them.

However when too many items are added to the list, the button at the bottom of this pop up window just floats away, outside of the bottom line of the modal window. Is there a specific CSS I should use to prevent this from happening (assuming the list can be infinite for now).

Sorry for not being able for posting a screentshot, I hope I was clear enough.

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Thanks!