Custom input type (split keyboard)

Question

I created a custom input view for the iPhone and decided to transfer it to the iPad. I wanted it to appear as a split keyboard, as it has only a few keys. The problem is that the iPad is building keyboards in Undocking in the current version, which makes my keyboard weird when it's undocked. How can I either prevent undocking of my user input or say that iOS is a split keyboard, so it does not display the line at the bottom.

The keyboard is a UIView with a clear background color. Since the UIView subtype is the two sides of the keyboard. When disconnected, the string is displayed under an understandable UIView for the entire keyboard. I either want to get rid of this line, or to prevent undocking.

Thanks!