Transparent picturebox over another picturebox

How can I put a transparent PictureBox on another PictureBox?

One transparent PictureBox works on my form but i can not put a transparent Pict开发者_Go百科ureBox over another PictureBox.

Here is a picture from my problem.

You need to call Control.BringToFront on the PictureBox you want to be in front (on top).