public void fillCheckBox()                                                                             // Uzupełniamy listę elementów
        {
            if (howManyItems == 0) return;
            int a = 0;
            for (int i = 0; i < howManyItems; i++)
            {
                if (GraphList[i].parent != 0) continue;
                maxTimeInSec += GraphList[i].seconds + GraphList[i].minutes * 60 + GraphList[i].hours * 3600 + GraphList[i].days * 24 * 3600;
                CheckedList.Add(new CheckBoxItem());
                CheckedList[a].owner = i;
                if (GraphList[i].name.Length <= 56)
                    checkedListBox1.Items.Add("[" + a + "] " + GraphList[i].name);
                else checkedListBox1.Items.Add("[" + a + "] " + GraphList[i].name.Substring(0, 56));

                checkedListBox1.SetItemChecked(a, true);
                a++;
            }

            for (int i = 0; i < howManyItems; i++)
            {
                if (GraphList[i].parent != 0) continue;
                GraphList[i].realPercentOfParent = (GraphList[i].seconds + GraphList[i].minutes * 60 + GraphList[i].hours * 3600 + GraphList[i].days * 24 * 3600) * 100.0 / maxTimeInSec;
            }

            for (int i = 0; i < checkedListBox1.Items.Count; i++)
            {
                GraphList[CheckedList[i].owner].visible = checkedListBox1.GetItemChecked(i);
            }
        }