If BeginInit was previously called, the base implementation will raise the Initialized event. Otherwise, if BeginInit was not called or it could not be determined whether BeginInit was called, Initialized is not raised and an exception is thrown instead.
Notes to Inheritors:
Implement this method to provide special handling that should happen when your element is initialized during the element loading process.
Your implementation should call the base implementation, because the base (default) implementation sets some internal flags to keep track of initialization.