Question: How can we display Delta y in a Mathcontainer Component using a Button?

In a Button, this command enables us to display in a Mathcontainer a Delta  (Delta). 

D(%Mathcontainer0 = 'Delta');

However, I want to display Delta y. (Delta y). If I write

D(%Mathcontainer0 = 'Delta y');

It doesn't work. I tried the following

D(%Mathcontainer0 = 'Delta(y)');

But it displays Delta(y)... I don't want the ().

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