There is no TextBox control in the WPF suite as the standard TextBox of MS gives all the features needed for such basic component. If you need any special or additional features that the MS control does not cover we will be glad to discuss or provide help. There is the RadMaskedTextBox control for specific input scenarios. We will be glad to hear any details on your requirements as we are always opened to client suggestions for new features and even new controls.
the Telerik team