I have an excel application which automatically adds textboxes when the user
clicks on a button. Each text box must accommodate two text lines: an upper
one and a lower one.

The upper line has bold 12-size bold arial font. This text line (text &
format) is generated by the code. The lower line is typed in by the user and
it must have a predefined format. I would like this line to be ready for my
users to start typing.

I would like to implement the following behavior in each textbox: whenever
the user clicks on the textbox the cursor must be on the lower text line,
which must have italic 10-size bold times new roman font: this lower line is
already formatted for the user to start typing. How can I accomplish this?