Combining tree and hierarchial layout in jgraph - layout

Question

I am trying to combine horizontal tree and hierarchial layout. I want the upper half of my graph to be tree layout and draw horizontally and teh lower half hierarchial layout.
I tried adding tree layout and hierarchial layout in the same beginUpdate block but i observe that teh hierarchial layout takes precedence and overwrites the tree layout of the graph.
Is there a way to overcome this? Below is what i have -
graph.getModel().beginUpdate();
try
{
Object v1 = graph.insertVertex(parent, null, "Hello", 1, 1, 80,
30);
Object v2 = graph.insertVertex(parent, null, "World!", 1, 1,
80, 30,"shape=rhombus;perimeter=rhombusPerimeter");
graph.insertEdge(parent, null, "Edge", v1, v2);
/* Apply tree Layout*/
mxCompactTreeLayout layout = new mxCompactTreeLayout(graph,true);
layout.execute(graph.getDefaultParent());
Object v3 = graph.insertVertex(parent, null, "Bye", 1, 1,80, 30,"shape=ellipse;perimeter=ellipsePerimeter");
Object v4 = graph.insertVertex(parent, null, "NoBye", 1, 1,80, 30,"shape=ellipse;perimeter=ellipsePerimeter");
//Object v5 = graph.insertVertex(parent, null, "Desc", 1, 1,
// 80, 30,"shape=ellipse;perimeter=ellipsePerimeter");
Object v6 = graph.insertVertex(parent, null, "World2!", 1, 1,80, 30,"shape=rhombus;perimeter=rhombusPerimeter");
graph.insertEdge(parent, null, "Yes", v2, v3);
graph.insertEdge(parent, null, "No", v2, v4);
graph.insertEdge(parent, null, "", v1, v6);
//Apply Hierarchial layout now
mxHierarchicalLayout layout1 = new mxHierarchicalLayout(graph );
layout1.setDisableEdgeStyle(false);
layout1.setFineTuning(true);
layout1.setIntraCellSpacing(50);
layout1.execute(graph.getDefaultParent());
}
finally
{
graph.getModel().endUpdate();
}