private void button1_Click(object sender, EventArgs e)
        {
            AlertFilterEditForm alertFilterEditForm = new AlertFilterEditForm();

            alertFilterEditForm.Initialize(webUrl, listName, listID, null, CurrentAlert, Fields);
            alertFilterEditForm.ShowDialog();
            FillFilters();
        }
        private void button2_Click(object sender, EventArgs e)
        {
            if (FiltersTreeView.SelectedNode == null)
            {
                MessageBox.Show("Please select a group/filter.");
                return;
            }
            EUCamlFilters orGroup = FiltersTreeView.SelectedNode.Tag as EUCamlFilters;

            if (orGroup == null)
            {
                orGroup = FiltersTreeView.SelectedNode.Parent.Tag as EUCamlFilters;
            }
            AlertFilterEditForm alertFilterEditForm = new AlertFilterEditForm();

            alertFilterEditForm.Initialize(webUrl, listName, listID, orGroup, CurrentAlert, Fields);
            alertFilterEditForm.ShowDialog();
            FillFilters();
        }