Text selection in RadNumericMaskedEntry

After some tries I found a solution. When get focus, just get the entry and do the selection

radNumericMaskedEntry.Focused += async (_, _) =>
                {
                    var radentry = radNumericMaskedEntry.Children.FirstOrDefault() as RadEntry;
                    if (radentry?.Text?.Length > 0)
                    {
                        //// Selection works only if wait cursor appearing
                        await Task.Delay(200);

                        radentry.CursorPosition = 0;
                        radentry.SelectionLength = radentry.Text.Length;
                    }
                };