button to control layers in morph hierarchy

OK, first message appeared not to send. Apologies if this is a repeat:


I'm trying to use a button to tell a morph to "go behind" another morph.
I.E., tell a text morph to go behind a sketch morph (and the other way
round). the text morph doesn't seem to understand #sendToBack.

What am I missing?

Thanks.


Lawson
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