Magic Sheet Target: Command

I really like the feature of having the target of a Magic Sheet object be a command, but I've run into a problem.

It seems strange enough that you have to type out the commands rather than using the hotkeys (haven't tried it on the console keys), but whatever, I know how to type.

How the heck do you put a "Clear" in there?

If I try to start a command with Clear, it just ignores it and piles it on whatever is already on the command line.

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