Sets the sprite used for the buttons in the pop-up box. spr must be a sprite consisting of three images, the first indicates the button when it is not pressed and the mouse is far away, the second indicates the button when the mouse is above it but not pressed and the third is the button when it is pressed. Unfortunately, alpha values are not taken into account. However, if the left-bottom pixel has an alpha value of 0, all pixels with that color will be considered transparent.
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