Block a form (in content) or Blocking the top navigation

I have a problem with my top navigation. I use some complex forms with inside the form a lot of entity's.Because of that i only use a form in content ( a pop up form is not allowed by Mendix due the entity's and members). When a user start for example an new contract request a form will open (in content). The user makes some selections and goes to the top navigation and click on the home button. On that moment the form is gone/ will close. I want to give the user a message (that his data will be gone) or I block the topnavigation when a user is inside a form so that it isn't allowed to click on a topnavigation button. Anyone an solution/experience with this problem?
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