Hi Mus'ab

Basically it's largely driven by convention, you can add actions to the Menu for your tree items to trigger different angular views to be loaded, but if you just click on an item by convention it will load the edit.html view from the folder associated with your tree.

so if you have Tree created like in the docs example

[Tree("developer", "favouriteThingsAlias", "Favourite Things Name")]
[PluginController("favouriteThings")]
public class FavouriteThingsTreeController : TreeController

The view will be loaded from this folder

/app_plugins/favouriteThings/backoffice/favouriteThingsAlias/edit.html

You then use angularJS to wire up the custom functionality of the tree so in the same folder as the edit.html add a package.manifest file:

/app_plugins/favouriteThings/backoffice/favouriteThingsAlias/package.manifest

In this file you can define resources, such as javascript and css files, and Umbraco will load these when the edit.html view is accessed

{
    "javascript": [
"~/App_Plugins/favouriteThings/backoffice/favouriteThingsAlias/edit.controller.js"
    ]
}

So the idea would be to create an angularJS controller inside one of the js resource files, and then tie your edit.html file to it using the ng-controller attribute

<div ng-controller="YourSite.FavouriteThings.EditController as vm">
    <form name="mySectionForm" novalidate>

        <umb-editor-view>

            <umb-editor-header
                name="vm.content.name"
                hide-alias="true"
                hide-description="true"
                hide-icon="true">
            </umb-editor-header>

            <umb-editor-container>
                // main content here
            </umb-editor-container>

            <umb-editor-footer>
                // footer content here
            </umb-editor-footer>

        </umb-editor-view>

    </form>
</div>

Umbraco has a number of directives you can use in your custom tree views for common interactions: https://our.umbraco.com/apidocs/v8/ui/#/api/umbraco.directives.directive:umbEditorHeader

regards

Marc