public void OpenBookEditor(object o)
{
if (ChosenBook == null) return;
BookEditor re = new BookEditor();
ViewModelBookEditor redc = re.DataContext as ViewModelBookEditor;
redc.SetAsEditor(this, ChosenBook);
re.ShowDialog();
}
public void OpenBookAdder(object o)
{
BookEditor re = new BookEditor();
ViewModelBookEditor redc = re.DataContext as ViewModelBookEditor;
redc.SetAsAdder(this);
re.ShowDialog();
}