I did it this way because I tried to add a back Button first with the class "back-button" that elementary Theme provides (you need a back button or something because if you have the item selected in the sidebar, the only way to go back is double clicking the photo), but it looks very ugly, because the dark Theme. Maybe we can add our own class, it's not something hard to do. And this remember me to report the problem to egtk.
I did it this way because I tried to add a back Button first with the class "back-button" that elementary Theme provides (you need a back button or something because if you have the item selected in the sidebar, the only way to go back is double clicking the photo), but it looks very ugly, because the dark Theme. Maybe we can add our own class, it's not something hard to do. And this remember me to report the problem to egtk.