The following code just display the first level node A, I added B as A's child,but node B doesn't show up.  Do you hev ideas?

Thasks!

// set tree column

col1.Key = "name";
col2.Key = "last";
col3.Key = "curr";
col4.Key = "diff";

UltraTreeNode aaNode = utree.Nodes["A"].Nodes.Add("B");

aNode.Cells["name"].Value = "A";
aNode.Cells["last"].Value = "432";
aNode.Cells["curr"].Value = "401";
aNode.Cells["diff"].Value = "31";

aaNode.Cells["name"].Value = "B";
aaNode.Cells["last"].Value = "333";
aaNode.Cells["curr"].Value = "222";
aaNode.Cells["diff"].Value = "111";