VB6 and VB.NET differ in how a radio button is given the focus when the end users presses the Tab key. Under VB6, when the end user tabs into a group of radio button, the button whose Value is True receives the focus. Conversely, under VB.NET the radio button with the lowest value of the TabIndex property receives the focus, regardless of whether it is checked or not.
VB Migration Partner accounts for this difference and correctly mimics the VB6 behavior.