set_active_layer(glDestNew); 

void	Add_Inset_Graph()
{
	//Graph1 is the source graph
	//maybe there are more than one layer in the graph.
	//if it is, you need a loop to get all the layers
	GraphLayer	glSource("Graph1", 0);
	//Graph2 is the destination graph
	GraphPage gpDest("Graph2");

	//add a new layer to hold the source graph
	gpDest.AppendLayers("origin");
	GraphLayer	glDestNew = gpDest.Layers(gpDest.Layers.Count()-1); 
	
	//get the data plots from the source graph,
	for(int nPlot=0; nPlot<glSource.DataPlots.Count(); nPlot++)
	{
		DataPlot dpSource = glSource.DataPlots(nPlot);
	
	//In ver7.5, GraphLayer::AddPlot() only supports Curve as parameter, so need get the Curve from DataPlot  
		Curve crv(dpSource);                  
		int nRes = glDestNew.AddPlot(crv);
	}
	
	//Using LabTalk script to control the positon of the layer
	LT_execute("layer 20 20 40 5;");
}