Hi Morten,

If you are looking to toggle the tree panel, Warren Buckley published a new blog post today showing an example of how to do this. Here is his code snippet:

angular.module('umbraco').controller('demo.toggler', function($scope, appState, eventsService) {
  //Create an Angular JS controller and inject Umbraco services appState & eventsService

  //Button Click - ToggleUmbracoNavigation
  $scope.toggleUmbracoNavigation = function() {

    //Get the current state of showNavigation
    var currentNavigationState = appState.getGlobalState('showNavigation');

    //console.log("currentNavigationState", currentNavigationState);
    //console.log("Inverse of currentNavigationState", !currentNavigationState);

    //Toggle the tree visibility
    appState.setGlobalState("showNavigation", !currentNavigationState);
  }

  //The eventService allows us to easily listen for any events that the Umbraco applciation fires
  //Let's listen for globalState changes...
  eventsService.on("appState.globalState.changed", function (e, args) {
    //console.log("appState.globalState.changed (args)", args);

    if (args.key === "showNavigation") {
      //console.log("showNavigation value", args.key, args.value);

      //If false (So hiding navigation)
      if(!args.value) {
        //Set css left position to 80px (width of appBar)
        document.getElementById("contentwrapper").style.left = "80px";
      }
      else {
        //Remove the CSS we set so default CSS of Umbraco kicks in
        document.getElementById("contentwrapper").style.left = "";
      }
    }
  });

});

Thanks, Dan.