Hello Lamees Afify,
In the RadDateTimePickerCalendar class you have to access the PopUp Form and the Calendar used in the DateTimePicker. RadCalendar has a property called FocusedDate. When you set this property the Calendar will automatically navigate to the FocusedDate.
To access the RadDateTimePickerCalendar you should use the GetCurrentBehavior() method of RadDateTimePickerElement and cast it to RadDateTimePickerCalendar. The PopUp in RadDateTimePickerCalendar has events which will help you to understand whether the drop down is opened or not. Such event is the Opened
event of RadDateTimePickerDropDown which I use as a pop up in the date time picker.
Please write me back if you need more assistance with this.
the Telerik team
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