Custom Column Example - How do set theme

[Jon]

Hi..
In your custom column example with the DateTimePicker. How do you set the theme of the DateTimePicker?
I've copied the code but am unable to set the theme or turn off the Week numbers.
thx


                            <controls:DateTimePickerColumn DataMemberBinding="{Binding CallActivity_date}" telerik:StyleManager.Theme="Vista" 
Header="Date/Time" HeaderTextAlignment="Left"
TimeInterval="0:30:0"
Width="155"
DataFormatString="g" >
                              </controls:DateTimePickerColumn>