The debugger can be configured to break on an exception before any handler is invoked (i.e it overrides your coded exception handling)
Open the Debug/Exception... dialog from the menu to check/modify which exceptions are caught in this way

Read this (and related links) for more info:http://msdn.microsoft.com/en-us/library/x85tt0dd.aspx

>>Does it even trap the exception? Do you throw the exeption to the previous exception handler?
>>
>Well it just interrupts the method it is in and just leaves, but continues at the next step after the call to the method where the terminal error occurred.
>
>Thanks.
>
>>>In "runtime" I don't seem to have a problem. I install a "global" error handler, and in case of unsupported errors, it triggers the errorhandler.... well most of the time.
>>>
>>>When I execute code in development, and there is an error, rather throwing a system (default) error; or appropriately call my errorhandler, the system seems to leave the method it is in and just continues.
>>>
>>>Is there a method of operation that solves this?
>>>
>>>Thanks.