Picture control: stick the image to a specified corner

[vix]

In a Picture Control, with the option "Stick image to corner" the image is always sticked to the upper-left corner of the control.

I suggest that the user should be able to specify the corner to which the image should be sticked (upper-left, bottom-left, upper-right, bottom-right).

I've been thinking to this properties because I have some picture controls used as a background images, and I need the background isn't moved when I drag a splitter (see this thread)