>I know that. My idea is that user select one date (as a first date) than with shift select last (desired) day and program selects automaticly all days between first and last clicked days. Or another idea, user select first day and than while holding pressed left mouse click mark all days he wants. Is that possible?
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>Sorry for trouble I make to you.

I'm sure it's possible, but it's something you'll have to add yourself (the class doesn't include that functionality).