Mendix render elements in Navigation

I would like to confirm something about how mendix render elements in the navigation.  1. How does mendix generate the UL in the Navigation? 2. What are the css selector that are available when the element is rendered? 3. Are the elements disabled by default when rendered? 4. Are the data-item-id rendered dynamically?Does it changes when rendered again?     I am asking these question simple because I want to have a automated test in my mendix app. Now I wanted to test a click on the Navigation element. When running my test am getting error saying Expected enabled element was not enabled I am guessing that the problem is with the element itself. For further information I ask on a separate forum kindly check :  
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