Is there any way to have a calendar control resize to fill its parent element?

I'm currently doing an investigation into different calendar controls, and really like the DayPilot control. But I need it to resize automatically when the window size changes.

It seems to me like the calendar will resize larger, but if the window shrinks, the calendar doesn't shrink. I've tried setting the HeightSpec to "Parent100Pct", "BusinessHours", etc. but if the container for the calendar is too small, the calendar never shrinks itself.