Even reading the forum I did not understand if the following is a bug or the normal behavior. When I use the Side Menu Layout element, it is not possible to use the Title Bar Back Button Clicked event after locking the Side Menu Layout. In fact, by clicking the Back Button in the Title Bar, the (locked) Side Menu opens again.
Steps to reproduce the issue
In design: insert a Side Menu Layout.
In blocks: lock the Side Menu Layout and then show the Title Bar Back Button.
Expected Behaviour
Title Bar Back Button Clicked should catch the click on the Back Button on Title Bar.