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.

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