The MultiCalendar combines X Microsoft Calendars that can be positioned in a grid with rows and columns. The selected dates, blackout dates and highlighted dates can be chosen from any calendar. The MultiCalendar will have a fast response no matter how many CalendarDayButtons are selected. The Background/Foreground of any CalendarDayButton can be easily customized based on its state(selected/highlighted/blackout/mouseOver/focused/today) and the background of any Calendar can be customized with an image or a brush. This feature is only available in the "Plus" version. Click here for more details about Xceed Toolkit Plus for WPF.