I have the following control defined in a simple Grid control:
Note that I have specified a TabIndex of 1. However when I tab through the UIElemets in the Window the RadNumericUpDown is always last. I have discovered that the template TextBox has a TabIndex of 2147483647 causing this behavior. As a work around I do this:
in the Loaded event. The result is as if the TabIndex was propagated to the templated TextBox.