Bug 356675 Composer is not properly detecting tab changes (temporary fix)

r+sr=neil

editor/ui/composer/content/editorOverlay.xul

@@ -897,6 +897,7 @@
                  tooltiptext="&layerBringToFront.tooltip;"/>
 
   <!-- Edit Mode toolbar -->
+  <tabs id="EditModeTabs" onselect="this.selectedItem.doCommand()"/>
   <tab id="NormalModeButton"   class="tab-bottom edit-mode _plain" type="text" selected="1" label="&NormalModeTab.label;"  oncommand="goDoCommand('cmd_NormalMode');"
           tooltiptext="&NormalMode.tooltip;"/>
   <tab id="TagModeButton"      class="tab-bottom edit-mode _plain" type="text" selected="0" label="&AllTagsMode.label;"    oncommand="goDoCommand('cmd_AllTagsMode');"