Antonio,

I hope the following VB.NET code snippet works
In C# it's of course exactly the same except for the syntax :-)

Everywhere you'd use the normal DataGrid you can simply replace it
with NoTabDataGrid.

You will notice that you might also need to intercept (ignore) the
keypad Left and Right arrows as they have a tab-like behaviour in the
grid.

Adios,
 Marius.

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Public Class NoTabDataGrid
  Inherits System.Windows.Forms.DataGrid

Public Sub New()
   ' do your own construction stuff here if necessary
   MyBase.New()
End Sub

Protected Overloads Overrides Sub Dispose(ByVal disposing As Boolean)
   ' do your own cleanup stuff here if necessary
   MyBase.Dispose(disposing)
End Sub

Protected Overrides Function ProcessCmdKey(ByRef msg As
System.Windows.Forms.Message, _
   ByVal keyData As System.Windows.Forms.Keys) As Boolean

   Dim tabbing As Boolean
   Dim forward As Boolean

   ' See if shift was pressed
   Dim shift As Boolean = ((keyData And Keys.Shift) = Keys.Shift)
   ' Get rid of the modifiers
   Dim theKey As Keys = keyData And (Not Keys.Modifiers)

   If theKey = Keys.Tab Then
     tabbing = True
     forward = (Not shift)   ' Shift-Tab = backward
   End If

   If tabbing Then
     Me.TopLevelControl.SelectNextControl(Me, forward, True, True, True)
     Return True
   Else
     Return MyBase.ProcessCmdKey(msg, keyData)
   End If

End Function

End Class