private async Task SetCurrentContent()
        {
            if (fvwFiles.SelectedItem == null || isLoading)
            {
                return;
            }

            FileSystemItem file = (FileSystemItem)fvwFiles.SelectedItem;

            foreach (FileControl control in fileControls.ToArray())
            {
                if (file.Equals(control.DataContext))
                {
                    isFirstOpening = false;
                    await control.Activate();
                }
                else
                {
                    control.Deactivate();
                }
            }
        }