I'm stuck on, certainly, a basic error from my part.
The simple first application I'm trying to create would allow to perform calculations by clicking on the red and green buttons on main screen (please see enclosed file)
Red buttons react fine, but the main big green button doesn't react to any click ... (no code attached so far for the minus green button).
I copied Sub ImageView1_Click and Sub ImageView2_Click and renamed them Sub ImageView2_Click and Sub ImageView4_Click and it worked fine. You are just missing the event Subs as far as I can see.