//Добавить катеогрию
private void addCategory_Click(object sender, RoutedEventArgs e)
{
CategoryModel m = new CategoryModel();
m.ParentName = (tree.SelectedItem as CategoryModel).Name;
CategoryEdit edt = new CategoryEdit(m);
// string sql="select "
edt.ShowDialog();
// ProductEdit edtp = new ProductEdit();
// edtp.ShowDialog();
}
//редактировать категорию
private void edtCategory_Click(object sender, RoutedEventArgs e)
{
CategoryEdit edt = new CategoryEdit((tree.SelectedItem as CategoryModel));
edt.ShowDialog();
}