private void BtnITFlitery_Click(object sender, RoutedEventArgs e)
        {
            lblITFinfo.Content = btnITFlitery.Content;
            listITFlitery      = PanelITF_db.PobierzITFZnaki();

            grdITFDane.Children.Clear();
            panelITF = null;
            panelITF = new PanelITF(2, listITFlitery);

            grdITFDane.Children.Add(panelITF);
        }
        private void BtnITFodch_Click(object sender, RoutedEventArgs e)
        {
            lblITFinfo.Content = btnITFodch.Content;
            listITFodch        = PanelITF_db.PobierzITFodch();

            grdITFDane.Children.Clear();
            panelITF = null;
            panelITF = new PanelITF(7, listITFodch);

            grdITFDane.Children.Add(panelITF);
        }
        private void BtnITFkategoria_Click(object sender, RoutedEventArgs e)
        {
            lblITFinfo.Content = btnITFkategoria.Content;
            listITFkategorie   = PanelITF_db.PobierzITFKategorie();

            grdITFDane.Children.Clear();
            panelITF = null;
            panelITF = new PanelITF(1, listITFkategorie);



            grdITFDane.Children.Add(panelITF);
        }