In order to remove the close button from the RadDateTimePicker you need to edit its template. You can do this very easy with Expression Blend. Just drop a DateTimePicker control on the design surface, right-click it and choose from the menu Edit Template -> Edit a Copy
. Then Blend will generate all the needed resources. Find the Border with x:Name="CloseButtonContainer"
, which contains the Close button and remove it.
Hope this information helps.
All the best,
the Telerik team
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