Hello, 

When i add this line in App.cs : 
host.Settings.EnableAutoZoom = false;

Then zoom in and zoom out for explorer will not work ( IE for example) and that what i need. But if i zoom in or zoom out
then open any telerik date picker, it will appear in other location of the screen.
Please try these steps to reproduce the error :
1) Add the previous line of code to app.cs
2) Change zoom to 150%
3) Try to open any datepicker
Regards,
Jalal