1. source_editor.js set default to checked
function renderWordWrap() {
if (tinyMCE.isMSIE || tinyMCE.isGecko)
document.write('<input type="checkbox" name="wraped" checked id="wraped" onclick="toggleWordWrap(this);" class="wordWrapCode" /><label for="wraped">{$lang_theme_code_wordwrap}</label>');
}
2. source_editor.htm set wrap="virtual"
<textarea name="htmlSource" id="htmlSource" rows="15" cols="100" style="width: 100%; height: 100%; font-family: 'Courier New',Courier,mono; font-size: 12px" dir="ltr" wrap="virtual"></textarea>