[SalesForce] Navigating to custom component from standard opportunity page in lightning experience

The one.app is the lightning app that has the sidebars and all the standard salesforce features.

When you create a custom app, you will notice your app has name like myApp.app. This app doesn't get any of the functionalities of the one.app. If you need a sidebar in this app, you would have to implement it yourself.

If you want to have the sidebar, may be you should navigate to a lightning component tab instead of a lightning app?

Of course this only works if the contents of your app can also be contained within a lightning component and added to a lightning component tab.

---EDIT--- Following this example, Here's how you would do it:

var urlEvent = $A.get("e.force:navigateToURL");
     urlEvent.setParams({
      "url": "https://lightningtest-dev-ed.lightning.force.com/one/one.app?source=aloha#eyJjb21wb25lbnREZWYiOiJvbmyI6ImxpZ2h0bmluZ2twcjpuZXN0ZWRDb21wb25lbnRzIn19LCJ0IjoxNDY3MzkwNDY0NzQwfQ%3D%3D"
    });
    urlEvent.fire();

This have been a puzzle for a long time for me.The fact that you cannot from a visualforce page go to a component, the only way i got it to work is by a little hack :

 window.parent.location = '/one/one.app#ew0KICAgICJjb21wb25lbnREZWYiIDogImM6TEMyOF9HZXN0aW9uQ29tcHRlIiwNCiAgICAiYXR0cmlidXRlcyIgOiB7fQ0KICB9';

from your visualforce page redirect to the parent location where the base64 encoding part represent the json component in base64 :

{"componentDef" : "c:LC28_GestionCompte","attributes" : {}}

from the above code, I am redirecting to the LC28_GestionCompte component. For sure this is not the recommended way, but it is the best option i found so far. And even salesforce said that there is no way for now. I serach for every possible post to be able to do it the nice way, but found none. So think this can help someone.