Thank you for the question.
In order to change the TabStop behavior of RadTextBox, you should actually set the TabStop
property of the TextBoxItem. The value of the RadTextBox.TabStop property is not relevant to the actual behavior of the control:
I hope this helps.
the Telerik team
Q1’11 SP1 of RadControls for WinForms is available for download
; also available is the Q2'11 Roadmap
for Telerik Windows Forms controls.