Make the background white and alpha color's configurable via the BlockUI.h
Added support for different interface orientations, controls still may not fit on an iPhone in landscape. However, works great for an iPad.
Make sure we show the alert on the main thread. Make sure user interaction is enabled for the alert.
Prevent the BlockAlert from being shown but now having the input focus.
Added an autoresizingMask so the alert view stays center through a rotation.