Work with functions you are already familiar with, with the Windows 7-like navigation. 

Windows 7 like keyboard and mouse navigation schemes make the control accessible to work with, since it employs an already familiar calendar interaction framework.
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Multiple dates selection and week number displays makes it easier for range selection of dates.
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Users can easily select date ranges with their keyboard or mouse. 
Calendars can take on the day of week headings and date formating customs of the culture assigned. 

Full localization support of month and day texts, ideal for applications that need to supported internationally.
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