private void AddNewFileType(ListBox control) {
     ICollection<FileTypeEntry> source = (ICollection<FileTypeEntry>)control.ItemsSource;
     FileTypeEntry item = new FileTypeEntry(this, "");
     source.Add(item);
     control.SelectedItem = item;
     control.ScrollIntoView(item);
     control.Focus();
     item.IsEditing = true;
 }
        private void AddNewFileType(ListBox control)
        {
            ICollection <FileTypeEntry> source = (ICollection <FileTypeEntry>)control.ItemsSource;
            FileTypeEntry item = new FileTypeEntry(this, "");

            source.Add(item);
            control.SelectedItem = item;
            control.ScrollIntoView(item);
            control.Focus();
            item.IsEditing = true;
        }