Irregular operation of Bind [4.27]

I have problem with binding dispatcher to event. In most of cases it works okey, but sometimes ( I cannot find any reason why ) code behaves like bind was never done.


When it dont work, dispatcher is called as it should be but event is never trigered.

Could someone is there any time when bind wouldnt work ?
Or give me some hint how to resolve this problem.

Thank you in advance for your help