Hello Jakkie Esschert van den,
Thank you for writing.
Actually, the described behavior is by design and if you want to set a multiline string to the Text property, you should use carriage return + new line sequence: "\r\n". Otherwise, you can use the Lines
property. This functionality is exactly the same as the default one, which can be found in standard Microsoft TextBox control.
Let me know if you have any other questions.
the Telerik team
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