Thanks for suggestion, but i didn't knew what to search. I am currently reading a WPF book and in a book i saw word diagram in it. At that moment i found WPF Diagram Designer article that is perfect. Since my native language is not english i could not remeber word, that would help me search on google
Not quite sure an "e.Handled = true" concept in messenger makes sense since the messages are going to be propogated in a random/arbitrary/indeterminate order. Its really up to the subscriber to determine if the message should be handled. Your "e.Handled = true" concept might just mean that somebody handled it and its up to the subcriber to play nice and check the flag. A lot of messenger implementations fire & forget the notifications in async mode too. Then it makes even less sense.
Now that I'v had a few days to thin about it, the subscriber should pass in it's id to the control Init. Could be a PK or a guid. If there are 3 tabs open, each instance of control would be intiailized with a different id.
Then, each subsequent call would have that Id passed with it. Then control's methods would only act if the Id passed in the message matches that sent in the 'init' method.
If it's not broken, fix it until it is
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