Focusing the controls in vb.net

Hello Everybody,

I have two textboxes and one DataGridView in my Form



The Tab Index of textbox1 is 1
The Tab Index of textbox2 is 2
The Tab Index of DataGridView is 3

Now If I press Enter in Textbox1 I get focus on textbox2
It is working OK
Now If I press Enter in DataGridView then I want the Focus On textbox2

This is an example
Actually I am working on creating a custom textbox which binds the textbox to a dataGridView

So dont give the answers like
Textbox2.Focus()
Because the next control is not known

Thanks in Advance