diff --git a/lib/GUI.py b/lib/GUI.py
index 5d66384..598ee6a 100644
--- a/lib/GUI.py
+++ b/lib/GUI.py
@@ -3,6 +3,7 @@
 from ecolab import registerParallel
 registerParallel()
 from ecolab import Parallel, myid
+from objectBrowser import Browser
 
 # list of windows to update each simulation step
 windows=[]
@@ -34,7 +35,7 @@ def exit(self):
         self.parallel.exit()
         exit()
 
-def gui(step):
+def gui(step,model=None):
     simulator=Simulator(step)
     if myid()>0: return
     windows.append(ref(runner))
@@ -44,6 +45,8 @@ def gui(step):
     ttk.Button(buttonBar,text="run",command=simulator).pack(side='left')
     ttk.Button(buttonBar,text="step",command=simulator.doStep).pack(side='left')
     ttk.Button(buttonBar,text="stop",command=simulator.stop).pack(side='left')
+    if model!=None:
+        ttk.Button(buttonBar,text="browse",command=lambda: Browser(model)).pack(side='left')
     try:
         runner.mainloop()
     except SystemExit:
diff --git a/lib/objectBrowser.py b/lib/objectBrowser.py
index 181a849..fa99599 100644
--- a/lib/objectBrowser.py
+++ b/lib/objectBrowser.py
@@ -15,13 +15,43 @@ def doMethod(event):
         Browser(member,selection[:-1])
     else:
         selection=selection.split('=')[0]
-        
         args=json.loads('['+listbox.args.get('1.0','end')+']')
-        val=getattr(listbox.object,selection)(*args)
+        member=getattr(listbox.object,selection)
+        val=member(*args)
         listbox.delete(index)
         listbox.insert(index,selection+'='+str(val))
         listbox.itemconfigure(index,foreground='blue')
+        if len(member)>0:
+            containerBrowser=Tk()
+            containerBrowser.wm_title(selection)
+            elements=Listbox(containerBrowser)
+            elements.pack(fill='both',expand=True)
+            if '.@keys' in member._list():
+                elements.insert('end',member.keys())
+            else:
+                for i in range(len(member)):
+                    elements.insert('end',str(i))
+            elements.bind('<Double-Button-1>',doElement)
+            elements.object=member
+            elements.title=selection
+
+def doElement(event):
+    listbox=event.widget
+    selectedItems=listbox.curselection()
+    if len(selectedItems)==0: return
+    index=selectedItems[0]
+    selection=listbox.get(index)
+    selection=selection.split('=')[0]
+    element=listbox.object[selection] if '.@keys' in listbox.object._list() \
+        else listbox.object[int(selection)]
+    if len(element._list())>0:
+        Browser(element,f'{listbox.title}[{selection}]')
+    else:
+        val=element()
+        listbox.delete(index)
+        listbox.insert(index,selection+'='+str(val))
 
+        
 class Browser:
     def __init__(self, object, title=''):
         if str(type(object))!="<class 'CppWrapperType'>":
diff --git a/models/panmictic_ecolab.py b/models/panmictic_ecolab.py
index c65ac29..e60257b 100644
--- a/models/panmictic_ecolab.py
+++ b/models/panmictic_ecolab.py
@@ -50,10 +50,7 @@ def step():
     plot('No. species',ecolab.tstep(),nsp)
     plot('Density',ecolab.tstep(),ecolab.density(), pens=ecolab.species())
 
-from objectBrowser import Browser
-browser=Browser(ecolab,'ecolab')
-    
-gui(step)
+gui(step,ecolab)