private void DatePicker_OnGotFocus(object sender, RoutedEventArgs e)
{
DatePicker @this = sender as DatePicker;
TextBox partTextBox = @this?.FindVisualChildren <TextBox>().FirstOrDefault(x => x.Name == "PART_TextBox");
if (partTextBox == null)
{
return;
}
Dispatcher.BeginInvoke((Action) delegate
{
Keyboard.Focus(partTextBox);
partTextBox.SelectAll();
}, DispatcherPriority.Render);
}