Created Issue: Crash in NTDLL.DLL [16095]

When I call Environment.Exit(0) in sample MVVM Application on menuitem click I get following crash

Problem signature:
Problem Event Name: APPCRASH
Application Name: AvalonDock.MVVMTestApp.vshost.exe
Application Version: 10.0.30319.1
Application Timestamp: 4ba2084b
Fault Module Name: ntdll.dll
Fault Module Version: 6.1.7600.16915
Fault Module Timestamp: 4ec49caf
Exception Code: c0000005
Exception Offset: 000248c5
OS Version: 6.1.7600.2.0.0.256.48
Locale ID: 1033
Additional Information 1: e8ad
Additional Information 2: e8adce1c2b9e7be834b4063ac3c53863
Additional Information 3: e8ad
Additional Information 4: e8adce1c2b9e7be834b4063ac3c53863

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