diff -u -r1.9 -r1.10
--- SimTrackerHitIdentifierReadoutDriver.java	16 Dec 2008 00:26:50 -0000	1.9
+++ SimTrackerHitIdentifierReadoutDriver.java	16 Dec 2008 00:35:48 -0000	1.10
@@ -30,14 +30,13 @@

         super(collectionNames);
     }
     

-    // FIXME: This should go in startOfData() but that method may not always be called.
-    public void detectorChanged(Detector detector)

+    public void startOfData()

     {
     	if (needCleanupDriver)    	
     	{
     		add(new ReadoutCleanupDriver(new ArrayList<String>(collections)));
     		needCleanupDriver=false;

-    	}    	

+    	}

     }
         
     protected void process(EventHeader header)

diff -u -r1.2 -r1.3
--- TrackerHitDriver.java	15 Dec 2008 21:09:00 -0000	1.2
+++ TrackerHitDriver.java	16 Dec 2008 00:35:48 -0000	1.3
@@ -187,15 +187,16 @@

     }
     
     public void startOfData()

-    {
-        super.startOfData();
-

+    {        

         // If readouts not already set, set them up
         if (_readouts.size() != 0)
         {
             System.out.println("Adding SimTrackerHitIdentifierReadoutDriver with readouts: "+_readouts);

-            super.add( new SimTrackerHitIdentifierReadoutDriver( _readouts ) );

+            super.add( new SimTrackerHitIdentifierReadoutDriver( _readouts ) );        

         }

+        
+        // Call this after added above driver, so that subdriver's startOfData() method is called. --JM
+        super.startOfData();

 
         // Only allow this once per job since readouts cannot be deleted for SimTrackerIdentifierReadoutDriver
         // FIXME: should be a robust system for changing readouts and eliminating duplicates in the readout driver