Step to reproduce:
1. Create Windows Forms project  with a form
2. Place RadDateTimePicker control on created form
3. Run application. It will display current date.
4. Click on dropdown arrow to open Calendar
5. Navigate to any month outside of the current date using navigation bar on top of the Calendar, but do NOT select any date
6. Close Calendar without selecting any date
7. Click on dropdown arrow to open Calendar again. Calendar will display current date, which is correct.
8. Now select any date in Calendar
9. Click on dropdown arrow to open Calendar again.
10. Navigate to any month outside of the selected date using navigation bar on top of the Calendar, but do NOT select any date
11. Close and reopen Calendar again. It will display month to which it was navigated in Step 10. Instead it suppose to display selected date