The control height is calculated automatically from the individual rows.
The minimal row height is set using MinCellHeight property.
In the row stacking mode (EventStackingMode="Row") the row height is extended automatically to fit all events. In the cell stacking mode (EventStackingMode="Cell") events are displayed in a single cell only, the cell height is fixed to RowHeight and a vertical scrollbar is displayed if necessary.
You can also limit the number of rows if you use ViewType="Weeks" and set Weeks as needed.