Check wether a view is visible ????

I have created an event for navigation purpose...
I have created a handle method within a view to navigate...
But it can happens that the event is raised and the view is not visible ...
Therefor navigation error...
How can i check wether my view is visible or not ?
Regards

Ok
kisS METHOD...
One window popup
   + One cancel button
   + One event raised
2 VIEWS A&B
   + ONE HANDLE FOR THE EVENT IN VIEW B...
2 times call of the popup window.... each times from a different view, 2 times event raised handled only in view B BUT...
When the popup is called from view A, and user presses the cancel button, the event is raised and the handle of view B is raised!
In the handler, i user navigation...
Problem is then : Navigation probleme because view B is not visible!

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