void add_title()
{
    GraphLayer gl = Project.ActiveLayer();  // get the active graph layer
    if(!gl)
    	return;
    
	DataPlot dp = gl.DataPlots(0);  // get the first dataplot in the layer
	if(!dp)
		return;
	
	string strDatasetName = dp.GetDatasetName();  // get data range of the plot
	string strBookShortName = strDatasetName.GetToken(0, '_');  // get short name of the workbook
	WorksheetPage wp(strBookShortName);
	if(!wp)
		return;
	
	string strBookLongName = wp.GetLongName();  // get long name of the workbook
	
    GraphObject go = gl.CreateGraphObject(GROT_TEXT, "MyTitle");  // create a text object
    if( go )
    {
    	go.Text = strBookLongName;  // set long name to the text object
    	go.Attach = 2; // attach text object to layer, 0 to Layer; 1 to Page; 2 to Axes
    	go.X = gl.X.From+(gl.X.To-gl.X.From)/2.0;  // middle of the X axis;
    	go.Y = gl.Y.To+go.DY;  // top of the layer
    }        
    gl.GetPage().Refresh();  // refresh the graph
}