Hello Rieni De Rijke,
Thank you for contacting us.
We introduced our new RadDateTimePicker control with Q2 release. We made some required changes to date and time pickers and one of this is to make SelectAll obsolete. Sorry for any inconvenience caused!
You could workaround this by using ChildrenOfType<> and to find the TextBox placed inside the control and set SelectAll() for the textbox.
Please do not hesitate to contact us if you require any further information.
All the best,
George
the Telerik team
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