Thank you for the question.
The Focus or Select methods may or may not work depending on the place where they are called. For example you can select MS TextBox only if you call Select in the form constructor:
However, if you want to call Focus method, you should do it at Form_Shown. Otherwise, you will not focus the textbox.
Considering the fact that we are hosting the standard TextBox in RadTextBox, you can set the focus to RadTextBox by calling the Select method of the hosted control:
The other way to set the focus to RadTextBox is by calling the Focus method of the hosted control in the Form_Shown:
sender, EventArgs e)
I hope this helps.
the Telerik team
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