hola, para cada textbox en su evento enter y leave
Código:
Private Sub TextBox2_Enter(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles TextBox2.Enter
TextBox2.BackColor = Color.Azure
End Sub
Private Sub TextBox2_Leave(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles TextBox2.Leave
TextBox2.BackColor = Color.White
End Sub
espero t sirve ahi em cuentas k tal t funciono