Hello Michael Hanson,
Currently, RadNumericUpDown doesn't have the IsEnabled
property. We are planning to include it for the service pack which is scheduled for the end of August. The purpose of the IsEditable
property is to constrain a user from any input inside the textbox. However, a user will be able to change the value by using the repeat buttons, keyboard up and down buttons or the mouse wheel.
the Telerik team
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