You can create multi-line RadTextBox controls by setting the TextMode property to "MultiLine". When the TextMode property is "MultiLine", the text box displays its value using multiple lines.
The Columns property determines the width of each line in characters, and the Rows property determines the number of lines the text box displays. The Wrap property determines how the value in the text box is displayed within the area defined by the Columns and Rows properties:
If the Wrap property is True, the value in the text box extends to the limit set by the Columns property, and then wraps to additional rows as necessary:
If the value in the text box extends beyond the number of rows specified by the Rows property, the text box gets a vertical scroll bar:
If the Wrap property is False, the value in the text box does not wrap. Additional lines are used only if the text value includes a new-line character. A horizontal scroll bar appears if the value of any line exceeds the limit set by the Columns property: