Ok, I will explain my projects with you.
My project is same as a part of your program.
I have a base picture (called picture 1).Then I click on picture2, the picture2 overlay on apart of picture1. then click on picture3,picture3 overlay on picture2 and picture1.
If user click on Remove button,and click on picture2, the picture2 will be removed from display.So we have picture3 overlay picture1.
But I can't control how to display picture2 is transparent to picture1 and picture3.Such as photoshop, at begin you have background layer, then you chose writing tool to write to the picture, it creates new layer. I want to know the technique you use to control each layer.Can you help me?
If possible can you share your code (in which version working with .net framework 1.1).thanks a lot.
Because I'm not good at English so I can't explain this problem clearly.