public int IndexOf(object item)
{
SharpTreeNode node = item as SharpTreeNode;
if (node != null && node.IsVisible && node.GetListRoot() == root)
{
if (includeRoot)
{
return(SharpTreeNode.GetVisibleIndexForNode(node));
}
else
{
return(SharpTreeNode.GetVisibleIndexForNode(node) - 1);
}
}
else
{
return(-1);
}
}