/// <summary>
 ///     Clears the invoice details
 /// </summary>
 private void Clear_Details()
 {
     issuedBy.Text = "";
     issuedBy.ClearValue(Control.BorderBrushProperty);
     OrderDate.ClearValue(Control.BorderBrushProperty);
     dueDate.ClearValue(Control.BorderBrushProperty);
     OrderDate.SelectedDate = DateTime.Today;             //set current date
     dueDate.SelectedDate   = DateTime.Today.AddDays(60); //set curent date +60
 }
 /// <summary>
 ///     The method that handles the event Selected Date Changed on the datepicker OrderDate.
 ///     Clears the red border.
 /// </summary>
 /// <param name="sender"></param>
 /// <param name="e"></param>
 private void orderDate_SelectedDateChanged(object sender, SelectionChangedEventArgs e)
 {
     OrderDate.ClearValue(Control.BorderBrushProperty);
 }