IE7: Access denied in dojo._base.event fixKeys when shift is pressed

[guest]

Here is the line that the Microsoft Script Debugger points to:

evt.keyCode = (c ? 0 : evt.keyCode);

I ran dijit/tests/form/test_Select.html, clicked inside a Select input field, and just pressed shift.

[sjmiles]

(In [8362]) Add another trap for read-only keyCode on IE, refs #2882.