private void addColButton_Click(object sender, EventArgs e)
        {
            if (elementsListView.SelectedIndices.Count > 0)
            {
                columnsListView.BeginUpdate();

                ListViewItem         item = elementsListView.SelectedItems[0];
                CdrElementDefinition def  = new CdrElementDefinition(
                    item.Text,
                    item.SubItems[1].Text,
                    item.SubItems[2].Text,
                    (string)valTypeListBox.SelectedItems[0]
                    );
                int idx;

                if (columnsListView.SelectedIndices.Count > 0)
                {
                    idx = _settings.InsertColumn(columnsListView.SelectedIndices[0] + 1, colHdrText.Text, def);
                }
                else
                {
                    idx = _settings.AddColumn(colHdrText.Text, def);
                }

                if (idx >= 0)
                {
                    columnsListView.VirtualListSize++;
                    columnsListView.Items[idx].Selected = true;
                    columnsListView.EnsureVisible(idx);
                    columnsListView.EndUpdate();
                }
                else
                {
                    columnsListView.EndUpdate();
                    MessageBox.Show(String.Format("Column with name \"{0}\" already exists!", colHdrText.Text), "Add new column", MessageBoxButtons.OK, MessageBoxIcon.Exclamation);
                }
            }
        }
        private void addColButton_Click(object sender, EventArgs e)
        {
            if (elementsListView.SelectedIndices.Count > 0)
            {
                columnsListView.BeginUpdate();

                ListViewItem item = elementsListView.SelectedItems[0];
                CdrElementDefinition def = new CdrElementDefinition(
                            item.Text,
                            item.SubItems[1].Text,
                            item.SubItems[2].Text,
                            (string)valTypeListBox.SelectedItems[0]
                            );
                int idx;

                if (columnsListView.SelectedIndices.Count > 0)
                {
                    idx = _settings.InsertColumn(columnsListView.SelectedIndices[0] + 1, colHdrText.Text, def);
                }
                else
                {
                    idx = _settings.AddColumn(colHdrText.Text, def);
                }

                if (idx >= 0)
                {
                    columnsListView.VirtualListSize++;
                    columnsListView.Items[idx].Selected = true;
                    columnsListView.EnsureVisible(idx);
                    columnsListView.EndUpdate();
                }
                else
                {
                    columnsListView.EndUpdate();
                    MessageBox.Show(String.Format("Column with name \"{0}\" already exists!", colHdrText.Text), "Add new column", MessageBoxButtons.OK, MessageBoxIcon.Exclamation);
                }
            }
        }