private void newFolderToolStripMenuItem_Click(object sender, EventArgs e) { if (treeView1.SelectedNode != null && treeView1.SelectedNode.Tag != null) { NewFolderDlg dlg = new NewFolderDlg(); if (dlg.ShowDialog(this) == System.Windows.Forms.DialogResult.OK) { ((TaskFolder)treeView1.SelectedNode.Tag).CreateFolder(dlg.FolderName); // Create folder under currently selected folder RefreshList(); } } }