public void ExcludeItem()
{
SdsiteXmlDocument doc = Service.Sdsite.CurrentDocument;
foreach (BaseTreeNode node in SelectedNodes)
{
if (node is ElementNode && !((ElementNode)node).Element.IsExclude)
{
ElementNode dataNode = node as ElementNode;
doc.ExcludeItem(dataNode.Element.Id);
}
}
}