Improve the experience of creating multiple assets.

Today once you create a data object, add some fields, and then you'd like to create some additional data objects you have to go back to the Project View in Library. It's very common to add more than one asset at a time. Therefore, it should be possible to create a new asset from Data Modeler, Form Modeler, Process Designer and other editors.

[Test]
When user leaves the editor to work on the new asset, make sure that the user is prompted to save the previous asset.