Start vba application automatically when the display is opened

Hello everybody! Currently I am working on a monitoring system using the PI ProcessBook. Everything is already working fine, but I still could not manage that the VBA script is starting automatically when the Display (ThisDisplay) is opened. The operators, which (should) use the system still have to push one START Button. I want to avoid this. Is there a possibility like in VBA of a Sub Main routine or a Form Load Event which automatically executes the code when the form is loaded? Thanks a lot for your help! Greetings Franz