This video demonstrates building a Tiling interface in Control4 using the MultiDisplay Manager. (MultiDisplay Manager does not work on all Control4 interfaces.)
Prior to performing the steps in this video, the Just Add Power system has been configured as a Standardized AMP system and all standard sources and displays have been setup in Control4 already. Watch a video of how to configure Control4 matrix control.
Download AMP Standardized Control4 drivers here.
AMP - Advanced Matrix Programmer - is a software that configures 3G and MaxColor Just Add Power devices into an HDMI matrix switching system. You can download AMP here.
As an alternative to programming the interface yourself, Blackwire produces an excellent MultiView Pro - Tiler Control App for Control4. Check it out!