how to disable auto collapse in Navigation tree?

I have a page with a navigation tree. When ever I click on a sub-item, the application goes to that page but also closes the submenu. this means that the user loses context in where they are, and also needs to open the sub menu everytime they want to navigate. Is there a way to disable this interaction?  
1 answers

I have solved this some times with plain javascript + CSS, for keeping the horizontal selection highlighted. What do you want to achieve, keep the vertical selection open? That will be a bit of a clumsy experience right?