The issue must be on how I focus on the CurrencyTB. The project you supplied worked flawlessly. When I selected the CurrencyTextBox, its contents were successfully selected. However to focus on the CurrencyTB I am currently using an OnKeyDown even on the previous TextBox:
private void SfTextBoxExt_KeyDown(object sender, KeyEventArgs e)
{
if (e.Key == Key.Enter)
currencytb.Focus();
}
Focusing on currencytb in that fashion does reproduce the situation I'm having. It's worth noting that if I use a standard WPF TextBox, it works with no issues.
Currently using VS 2017 64-bit and using the latest version of the Essentials (15.4.0.17).
Attachment:
TextBoxWpf_8d22076.rar