Android Question Set number of decimal places

Sub txtTest_FocusChanged (HasFocus AsBoolean)
  If IsNumber(txtTest.Text) Then
    If HasFocus=False Then
     ' txtTest.Text=NumberFormat(txtTest.Text,0,3) ' you can use this line as an alternative
      txtTest.Text=NumberFormat2(txtTest.Text,0,3,3,False)
    End If
  End If
End Sub