Add back button. Just needs plumbing in.

assets/css/library.css.sass

@@ -16,6 +16,15 @@
       right: 10px
       top: 8px
       @include button
+    a.back
+      position: absolute
+      left: 10px
+      top: 8px
+      &:before
+        margin-right: 0.25em
+        @extend .icon
+      @extend .icon-chevron-left
+      @include button
   &.show
     top: 0
     header

assets/js/controls/library.js

@@ -44,6 +44,10 @@ var Library = can.Control.extend({
     this.nextPane();
   },
 
+  removePane: function(data) {
+    this.previousPane();
+  },
+
   'a.close click': 'hide',
 
   'route': function(data) {
@@ -53,9 +57,12 @@ var Library = can.Control.extend({
   ':page route': function(data) {
     if (data.page == 'library') {
       this.show();
-      if (data.show) {
+      if (data.pane > this.browser.currentPane) {
         this.addPane(data);
       }
+      else if (data.pane < this.browser.currentPane) {
+        this.removePane(data);
+      }
     }
   }
 

public/views/library.ejs

@@ -1,4 +1,7 @@
 <header>
+  <% if (browser.attr('currentPane') > 0) { %>
+    <%== can.route.link('Back', { page: 'library', pane: browser.attr('currentPane') - 1 }, { class: 'back' }) %>
+  <% } %>
   <a class="close" href="#!">Close</a>
   <h1><%= browser.attr('title') %></h1>
 </header>