durandal 2.0 custom dialog master-detail - mvvm

Question

After upgrading to durandal 2.0, I found I needed to convert my master list page to use the showDialog function instead of showModal.
Previously my master model looked like this:
define(['durandal/amd/require', 'durandal/app', 'durandal/viewLocator', 'durandal/system', 'durandal/plugins/router', 'durandal/lib/tableModel', 'viewmodels/product'], function (require, app, viewLocator, system, router, table, product) {
var tm = {
tableModel: new tableModel(),
createProduct: function (data) {
app.showModal(product, data);
}
}
//...
return tm;
}
Then in my product detail view page I could close the modal easily like so
data-bind="click: $root.modal.close">Close
Now in Durandal 2.0 it is much harder to get right.
The code in the masterpage is now
define(['durandal/app', 'durandal/viewLocator', 'durandal/system', 'plugins/router', 'lib/xhrs', 'lib/tableModel'], function (app, viewLocator, system, router, xhrs, table, product) {
var tm = {
tableModel: new tableModel(),
createProduct: function (data) {
app.showDialog(product, data);
}
}
//...
return tm; }
But the way to access the close function is annoying:
Firstly I have to require the 'plugins/dialog' into the product detail viewmodel; which I would prefer not to do as I don't think the detail viewmodel needs to know that it is a dialog, only the master list viewmodel needs to know that.
then in the compositionComplete event of the product detail view model I assign:
prodedit.close = function () {
dialog.close(prodedit);
}
(prodedit is the returned as the product detail vm)
In this way the product detail dialog can be closed using this:
data-bind="click: $root.close"
OK NOW HERE IS MY ISSUE:
This will work to popup the dialog once or twice, but then fails from then onward without an error. The only thing I can see is that dialogActivator.activateItem hits its fail line: dfd.resolve(false);
Interestingly if I do pause long enough on breakpoints the issue does not occur. But once it occurs once, it never works again to open the dialog.
Is there a better way to do this?
Thankyou.