I don't think there's support for that directly, but you could work around
it by resizing the picturebox such that the top right corner of the image is
in the top right corner of the picturebox, such as:
Image bitmap = this.pictureBox1.Image;
this.pictureBox1.Bounds = new Rectangle(this.pictureBox1.Right -
bitmap.Width, this.pictureBox1.Top, bitmap.Width, bitmap.Height);