This demo illustrates how report controls can be vertically anchored to top, bottom, or both sides of a band, which contains these controls. Use the XRControl.AnchorVertical property to accomplish this.
In this demo, you can see two columns. The right column displays a car description, which is different for each car, and the left column contains a car image, which is anchored to top and bottom band sides. This allows its background to fill all empty space between top and bottom labels.