When you edit a widget and change it we do not refresh the entire page - it does not go to its entire lifecycle. In your custom control designer you can place the following code in the _saveChangesSuccess handler:
before the line for window refresh:
window.parent.location.href = window.parent.location.href;
so when you click "Save" this should show your changes. We use the same approach when you change the template and force the page to go to its lifecycle, so you will see the changes.
All the best,
the Telerik team
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