picturebox superpose

Question

Hello: I'm doing my finally proyect in the University in Visual Studio # .NET and I'm trying to put some PictureBox near to other PictureBox, but some of the Image I can't see, are there any property to see all Images of the PictureBox although a PictureBox is on other PictureBox. How can I do it?. I have to work with lines, lines and circles and I have to keep it in ArrayList or similar to work with it. I have to draw a decision tree. Are there PictureBox transparent. I listen in other forum that I have to work with capes, but I don't know how to do it. Can sombody help me!!! Do you understandme?, I'm from Spain. Thank you.