Similar to the all of the controls in the Telerik UI for WinForms suite, RadDateTimePicker
also offers Focus
private void radButton1_Click(object sender, EventArgs e)
I have attached my sample project for your reference. Please give it a try and see how it works on your end.
In case you are still experiencing any further difficulties, feel free to modify it in a way to reproduce the experienced issue and get back to me with it so I can investigate the precise case. Thank you in advance.
I hope this information helps. If you need any further assistance please don't hesitate to contact me.
Dess | Tech Support Engineer, Sr.