diff --git a/experimental/tracer/main/store.go b/experimental/tracer/main/store.go
index aecee9e02..dd1637037 100644
--- a/experimental/tracer/main/store.go
+++ b/experimental/tracer/main/store.go
@@ -4,13 +4,15 @@ import (
 	"math/rand"
 	"sync"
 	"log"
+	"fmt"
+	"sort"
 
 	"github.com/msackman/skiplist"
 
 	"github.com/weaveworks/scope/experimental/tracer/ptrace"
 )
 
-const epsilon = int64(5)
+const epsilon = int64(5) * 1000 // milliseconds
 
 // Traces are indexed by from addr, from port, and start time.
 type key struct {
@@ -19,14 +21,25 @@ type key struct {
 	startTime int64
 }
 
+func (k key) MarshalJSON() ([]byte, error) {
+	return []byte(fmt.Sprintf("\"%x.%x.%x\"", k.fromAddr, k.fromPort, k.startTime)), nil
+}
+
 type trace struct {
 	PID      int
+	Key      key
 	ServerDetails *ptrace.ConnectionDetails
 	ClientDetails *ptrace.ConnectionDetails
 	Children []*trace
 	Level    int
 }
 
+type byKey []*trace
+
+func (a byKey) Len() int           { return len(a) }
+func (a byKey) Swap(i, j int)      { a[i], a[j] = a[j], a[i] }
+func (a byKey) Less(i, j int) bool { return a[i].Key.startTime < a[j].Key.startTime }
+
 type store struct {
 	sync.RWMutex
 	traces *skiplist.SkipList
@@ -67,6 +80,7 @@ func (s *store) RecordConnection(pid int, connection *ptrace.Fd) {
 
 	newTrace := &trace{
 		PID: pid,
+		Key: newKey(connection),
 		ServerDetails: &connection.ConnectionDetails,
 	}
 	for _, child := range connection.Children {
@@ -76,7 +90,7 @@ func (s *store) RecordConnection(pid int, connection *ptrace.Fd) {
 		})
 	}
 
-	newTraceKey := newKey(connection)
+	newTraceKey := newTrace.Key
 
 	// First, see if this new conneciton is a child of an existing connection.
 	// This indicates we have a parent connection to attach to.
@@ -119,11 +133,20 @@ func (s *store) Traces() []*trace {
 	s.RLock()
 	defer s.RUnlock()
 
-	traces := []*trace{}
+	traces := map[key]*trace{}
 	var cur = s.traces.First()
 	for cur != nil {
-		traces = append(traces, cur.Value.(*trace))
+		trace := cur.Value.(*trace)
+		traces[trace.Key] = trace
 		cur = cur.Next()
 	}
-	return traces
+
+	result := []*trace{}
+	for _, trace := range traces {
+		result = append(result, trace)
+	}
+
+	sort.Sort(byKey(result))
+
+	return result
 }
diff --git a/experimental/tracer/ui/index.html b/experimental/tracer/ui/index.html
index c9a1aed35..a8e29d187 100644
--- a/experimental/tracer/ui/index.html
+++ b/experimental/tracer/ui/index.html
@@ -18,6 +18,7 @@
     <script>
     $(function () {
       var currentContainer = null;
+      var expandedTrace = null;
       var containersByID = {};
       var containers = [];
       var traces = [];
@@ -28,6 +29,12 @@
         }
       });
 
+      Handlebars.registerHelper('isExpanded', function(options) {
+        if (expandedTrace && this.Key === expandedTrace) {
+          return options.fn(this)
+        }
+      });
+
       Handlebars.registerHelper('spaces', function(input) {
         return new Array(input + 1).join("> ");
       });
@@ -51,6 +58,7 @@
       });
 
       Handlebars.registerPartial('traces', $("#traces").html());
+      Handlebars.registerPartial('children', $("#children").html());
 
       function render() {
         var template = $('script#process-template').text();
@@ -80,7 +88,7 @@
             containersByID[container.Id] = container
           });
           // auto-select first container
-          if (containers.length) {
+          if (containers.length && currentContainer === null) {
             currentContainer = containersByID[containers[0].Id];
           }
           render();
@@ -118,6 +126,16 @@
           type: 'DELETE',
         });
       })
+
+      $("body").on("click", "table tr.trace", function() {
+        var key = $(this).data("key");
+        if (expandedTrace === key) {
+          expandedTrace = null;
+        } else {
+          expandedTrace = key;
+        }
+        render()
+      })
     })
     </script>
     <style>
@@ -174,6 +192,9 @@
         opacity: 0.4;
         font-weight: normal;
       }
+      tr.trace {
+        cursor: pointer;
+      }
       .mainview {
         margin-top: 2rem;
       }
@@ -187,6 +208,28 @@
       }
     </style>
     <script type="text/x-handlebars-template" id="traces">
+      {{#.}}
+      <tr class="trace" data-key="{{Key}}">
+      {{#if ServerDetails}}
+        {{#with ServerDetails}}
+        <td>{{spaces ../Level}}{{ts Start}}</td><td>{{duration .}}</td>
+        <td>{{../PID}}</td><td>{{FromAddr}}:{{FromPort}}</td>
+        <td>{{ToAddr}}:{{ToPort}}</td><td>{{count ../Children}}</td>
+        {{/with}}
+      {{else}}
+        {{#with ClientDetails}}
+        <td>{{spaces ../Level}}{{ts Start}}</td><td>{{duration .}}</td>
+        <td>{{../PID}}</td><td>{{FromAddr}}:{{FromPort}}</td>
+        <td>{{ToAddr}}:{{ToPort}}</td><td>{{count ../Children}}</td>
+        {{/with}}
+      {{/if}}
+      </tr>
+      {{#isExpanded}}
+      {{>children Children}}
+      {{/isExpanded}}
+      {{/.}}
+    </script>
+    <script type="text/x-handlebars-template" id="children">
       {{#.}}
       {{#if ServerDetails}}
         {{#with ServerDetails}}
@@ -203,7 +246,7 @@
           <td>{{ToAddr}}:{{ToPort}}</td><td>{{count ../Children}}</tr>
         {{/with}}
       {{/if}}
-      {{>traces Children}}
+      {{>children Children}}
       {{/.}}
     </script>