private void FolderTreeView_DoubleClick(object sender, System.EventArgs e)
        {
            FolderTreeNode ftn = this.SelectedNode as FolderTreeNode;

            //			ftn.Open();
            ftn.Expand();
        }
 private void FolderTreeView_KeyPress(object sender, System.Windows.Forms.KeyPressEventArgs e)
 {
     if (e.KeyChar == '\n')
     {
         FolderTreeNode ftn = this.SelectedNode as FolderTreeNode;
         //				ftn.Open();
         ftn.Expand();
     }
 }