private void copyPropertiesToolStripMenuItem_Click(object sender, EventArgs e)
{
if (multiSelectTreeviewElementsGroups.SelectedNodes.Count != 1)
return;
ElementNode sourceNode = multiSelectTreeviewElementsGroups.SelectedNode.Tag as ElementNode;
_clipboardProperties = new List<IPropertyModuleInstance>();
foreach (IPropertyModuleInstance property in sourceNode.Properties) {
_clipboardProperties.Add(property);
}
}