Currently the video inputs can only be controlled through the schematic logic. There are two objects in the “Display” category, VIDEO and VIDEOINPUT.
VIDEO controls whether video mode is active or not, and VIDEOINPUT controls which input is active. VIDEO is level sensitive, meaning if the input is true the display is in video mode, and if it is false the display is in graphics mode. The VIDEOINPUT object works like a radio button control, whenever any of the four inputs is true it will switch to that input.
The VIDEO object is supported by the 550MDI and 700MDI, whereas the VIDEOINPUT object is only supported by the 700MDI.