spark textarea : enter key split paragraph

I'm new in this forum so hi everybody !

I have a question about the spark textarea and TLF. I try to do an editor (like wysiwyg but more simpler) and I have a problem :

When I type for example :

------

test line 1

test line 2

-------

the enter key split the paragraphs. I can see it when I do

     TextConverter.export(editor.textFlow,TextConverter.TEXT_LAYOUT_FORMAT, ConversionType.STRING_TYPE).toString();

It returns

     "<p><span>test line 1</span></p><p><span>test line 2</span></p>" instead <p><span>test line 1<br/>test line 2</span></p>

I tried to set a configuration for the textflow of the textarea like this :

               var config:Configuration = TextFlow.defaultConfiguration;
                config.manageEnterKey = false;
               
                editor.textDisplay.textFlow = new TextFlow(config);

I used this to stop the splitting but nothing happens. When I try the exportation with TextConverter, it return the same thing :

     <p><span>test line 1</span></p><p><span>test line 2</span></p>

Is it possible to have br tag or no ?

Thanks in advance ^^