fgPhaseB.Rows[i].IsNode = true;
fgPhaseB.Rows[i].Node.Level = 1;

 

fgPhaseB.Tree.Column = 0;
fgPhaseB.Tree.Style = TreeStyleFlags.SimpleLeaf;

 

// 折り
flexData.Rows[i].Node.Collapsed = true;

// 展開
flexData.Rows[i].Node.Expanded = true;