Why TCL interactive interpreter tries to auto-complete commands that were bound by the application to C functions?

I defined my own command 'g'.
When this command is in a script file it's executed fine in a batch.
But when I try to type it in interactive mode I get this:

% g
ambiguous command name "g": get gets glob global glut

Why it does this and how do I disable this auto-completion?

Yuri

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