private void Formularz_Load(object sender, EventArgs e)
 {
     GridFiller.FillProductsGrid(ProductsGrid);
     GridFiller.FillPricesGrid(CenyGrid);
     GridFiller.FillPriceListsGrid(CennikiGrid);
     GridFiller.FillSummaryGrid(PodsumowanieGrid);
 }
 private void TabControl_SelectedIndexChanged(object sender, EventArgs e)
 {
     GridFiller.FillPricesGrid(CenyGrid);
     GridFiller.FillPriceListsGrid(CennikiGrid);
     GridFiller.FillSummaryGrid(PodsumowanieGrid);
 }