change the calendar control's error message

I have a number of calendar controls which are used to pick dates, however they all have the ability to key the date in and if you enter an invalid format for the date value, they raise the "Conversion Error Occurred" error which displays on screen in the message box.

I want to replace this error with something more user friendly. I have tried adding messages to a bundle and defining the bundle in the app config, but it does not seem to work.

Anyone got any ideas how to do this?

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[520 byte] By [bentownsend] at [2007-11-26 9:40:17]