I've solved this... credit to http://blog.brunoscopelliti.com/run-a-directive-after-the-dom-has-finished-rendering/

Use the angular $timeout functionality - but without a delay (set it to zero).. this adds it to the "queue" and will only fire when Archetype et al have finished creating the new instance.

You need to pass $timeout to your Controller:

angular.module("umbraco")
    .controller("My.FileUploadProgress",
     function ($scope, $timeout) {

Then just call your function via a timeout (note how a var is used and a function - otherwise the params are passed immediately not at timeout):

previewTimeout = $timeout(function () { SetPreviewImage($scope.model.value, $("#" + $scope.model.alias + "-parent")); }, 0);

or wrap your controller code in one:

 angular.module("umbraco").controller("My.FileUploadProgress",
    function ($scope, $timeout) {
     initTimeout = $timeout(function () {
         assetsService
        .load([
             [[... your js...]]
        ])
        .then(function () {

             [[... your custom controller code]]]

            });
        });

     }, 0);
 });

Hope this helps someone in the future!

Steve

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