New Post: Keeping the DateTimePicker's calendar open

I need the calendar to always be visible on the DateTimePicker. I already know about the IsOpen attribute that I can add to the XAML, but even when this is set to true, the calendar will close itself after a date is choosen.

I tried to capture this event by adding the LostFocus attribute to the XAML

<xctk:DateTimePicker LostFocus="KeepDatePickerOpen" Name="dpMain" IsOpen="True"></xctk:DateTimePicker>

and inside that method I simply run

dpMain.IsOpen = true;

but it's not opening the calendar for me even though a debugging breakpoint does show me this code is running, what am I missing?