Automatic change of bands size
Bands are containers. Therefore changing of their size is the same as changing of containers size. Band size can be changed depending on components positioned on this band. But bands have the particular feature. Bands can automatically change only the height (the width for cross-bands). For example, if there is a component, which lower part is out of bounds, on the band, then, if to set the CanGrow property of the is band in True, the band height will be increased with the report generator. After increasing, the lower part of the band will concur with the bottom of the component. This means that the whole component is positioned in the band.
Automatic band height growing.

So if to set CanShrink property in True and there is the space between the lower part of the component and the bottom of the band then the band height will be shrunk.
Automatic shrinking of the band height.
