Visual Studio and C# Multi-line Build Event Editing

I sometimes use build events to invoke tools such as xsd.exe and wsdl.exe for code generation purposes. Typically this requires a build event script with multiple lines. An annoying 'feature' of Visual Studio 2005 is that if you press the Enter key to create a new line in a build script, the OK button is activated and the dialog is closed. Ctrl+Enter seems to do the trick however.