wxWidget newbie, trouble w/ multiline

[Buttshark69]

Hello, Im new to wxWidgets and C++,
our class was originally learning C languge with console, and our prof. suddenly decides
it's a good idea to shift to C++ and Wxwidgets without a warning then gave a very few
examples (basics of the basics) and immediately gave us Laboratory Activities to do.
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We were only shown that to Output a result, you should use SetValue();

The SetValue only displays the last %s, which is textbox3 and I cant find how to
output all 3 strings in the resultbox.

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wxString textbox1;
wxString textbox2;
wxString textbox3;

textbox1= firstbox->getvalue();
textbox2= secondbox->getvalue();
textbox3= thirdbox->getvalue();

resultbox->SetValue(("%s \n %s \n %s", textbox1, textbox2, textbox3));

The multi-line option in the resultbox((wxEdit box)) is already "True".

We were suppose to get the strings on first to third box then output them as seen below in the "resultbox" in multiple lines.

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String in firstbox.
String in secondbox.
String in thirdbox.

What function do I use to obtain the output above in multiple lines in wxwidget?

[doublemax]

First of all: Is the wxTextCtrl high enough, so you can see multiple lines?

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resultbox->SetValue(("%s \n %s \n %s", textbox1, textbox2, textbox3));

This should be:

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resultbox->SetValue( wxString::Format("%s \n %s \n %s", textbox1, textbox2, textbox3) );