I has created global Controller class "OneInstanceController" for visualforce page "OneInstance". In my case I open a lot of pages "OneInstance" in multiple tabs. Each page should be copy of others for all time. I need use only one instance of controller class for each created page. Can I do it?
my problem: Page use in custom component in sidebar. And when I open new tab (Sales app), new page is created, new Instance of controler is created and I miss all variables in controller - they are also reloaded.
Use one instance of controller, it help me, I think.