Get Assembly where instance is declared in XAML

I have a framework.dll, customerFramework.dll and customer.exe.

Inside of the framework.dll is a customControl declared which can be placed in customerFramework.dll or in customer.exe.

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What I want to know is the assembly name inside of the customControl, where the customControl has been placed.

If the customControl is placed in customerFramework.dll and I use the Assembly.() methods, I get the wrong informations

• GetEntryAssembly(): customer.exe
• GetCallingAssembly(): framework.dll
• GetExecutingAssembly(): framework.dll

Is there a hidden function to get this information?