we have prepared a test project, using the VerticalAlignment property set to Stretch and the RadCalendar instance is shown as expected (see the attached screenshot).
There is some not utilized space under the calendar, but the reason for that is that we are keeping the square shape of day cells, and that is the maximum stretch possible to be applied.
Do you need to reshape the day cells to rectangles in order to remove any empty space below the calendar?
the Telerik team
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