Stepping through the Umbraco.PropertyEditors.ContentPickerController code, I eventually get to where it loads the dialog with:

//dialog
$scope.openContentPicker = function () {
var d = dialogService.treePicker($scope.cfg);
};

This is called from clicking on the '+ Add' link in the property editor, which is bound to the function via:

<a href="#" ng-click="openContentPicker()" prevent-default="">
<localize key="general_add" class="ng-isolate-scope ng-scope">Add</localize>
</a>

I'm wanting to use my own tree picker view and controller, but am not sure how.  Do I write a plugin for this, and if I'm writing a plugin, can I re-use the original Content Picker markup and javascript?

Thanks,
Mark Stoddard