PHP Change default value for Select list - php

Question

I have this little issue with the price form for my Joomla backend.
The default value is always "nothing", so I just need to set "Euro" as default (see screenshot).
I'm pretty newbie with PHP, so I can't do it by myself..
Here is the part of code that realizes this form:
$htmlPrice = '<div class="jomcomdevPriceRow">';
$htmlPrice .= '<div class="control-group" style="float: left; margin-right: 10px;">';
$htmlPrice .= '<label> '.JText::_('COM_JOMCOMDEV_FIELD_PRICE_NETTO').'</label><input type="text" name="' . $this->name.'[price_netto][]" id="' . $this->id . 'ValueNetto"' . ' value="" />';
$htmlPrice .= '</div>';
$htmlPrice .= '<div class="control-group" style="float: left; margin-right: 10px;">';
$htmlPrice .= str_replace("\n", '', '<label is="jform_featured-lbl"> '.JText::_('COM_JOMCOMDEV_FIELDSET_PRICE_GROUP').'</label>'.JHtml::_('select.genericlist', JHtml::_('jdcategory.options', 'com_jomestate.price', array('onlyroot' => 0)), $this->name.'[type_id][]',"", 'value', 'text', null, true));
$htmlPrice .= '</div>';
$htmlPrice .= '</div>';
I hope I'm clear enough. Thank you in advance.
Screenshot:
http://i.stack.imgur.com/2Ix39.png
UPDATE
Hmm, I don't know really where is configured this element. Here is full code, maybe I'm looking a wrong part..
defined( '_JEXEC' ) or die( 'Restricted access' );
class JFormFieldJdPrice extends JFormField
{
/**
* #var string The form field type.
* #since 11.1
*/
public $type = 'JdAddress';
/**
* Method to get the field input markup.
*
* #return string The field input markup.
*
* #since 11.1
*/
public function getInput()
{
$id = JRequest::getInt('id');
// if(empty($id)) {
// $html = '<div style="padding: 10px; margin: 10px 0;">';
// $html .= JText::_('COM_JOMCOMDEV_PRICEADD_NOID_INFO');
// $html .= '</div>';
// return $html;
// }
$htmlPrice = '<div class="jomcomdevPriceRow">';
$htmlPrice .= '<div class="control-group" style="float: left; margin-right: 10px;">';
$htmlPrice .= '<label> '.JText::_('COM_JOMCOMDEV_FIELD_PRICE_NETTO').'</label><input type="text" name="' . $this->name.'[price_netto][]" id="' . $this->id . 'ValueNetto"' . ' value="" />';
$htmlPrice .= '</div>';
$htmlPrice .= '<div class="control-group" style="float: left; margin-right: 10px;">';
$htmlPrice .= str_replace("\n", '', '<label is="jform_featured-lbl"> '.JText::_('COM_JOMCOMDEV_FIELDSET_PRICE_GROUP').'</label>'.JHtml::_('select.genericlist', JHtml::_('jdcategory.options', 'com_jomestate.price', array('onlyroot' => 0)), $this->name.'[type_id][]',"", 'value', 'text', null, true));
$htmlPrice .= '</div>';
$htmlPrice .= '</div>';
$link = JURI::root()."index.php?option=com_jomcomdev&format=raw&task=ajax.price&name=first&id=";
$runScript = "
window.addEvent('domready', function() {
var options = {htmlPrice: '".$htmlPrice."', link: '".$link."', selector: $$('#".$this->id."')};
Comdev.price.init(options);
});
";
$document = JFactory::getDocument();
$document->addScriptDeclaration($runScript);
JText::script('COM_JOMCOMDEV_JS_BUTTON_ADD');
JText::script('COM_JOMCOMDEV_JS_BUTTON_DELETE');
JText::script('COM_JOMCOMDEV_JS_BUTTON_OPTION');
JText::script('COM_JOMCOMDEV_FIELD_PRICE_NETTO');
$html = '';
$html .= '<div id="'.$this->id.'">';
if(!empty($id)) {
$data = Main_Price::get($id, (string) $this->element['extension']);
foreach($data AS $d) {
$html .= '<div class="jomcomdevPriceRow">';
$html .= '<div class="control-group" style="float: left; margin-right: 10px;">';
$html .= '<label is="jform_featured-lbl"> '.JText::_('COM_JOMCOMDEV_FIELD_PRICE_NETTO').'</label><input type="text" name="' . $this->name.'[price_netto][]" id="' . $this->id . 'ValueNetto"' . ' value="'.$d->price_netto.'" />';
$html .= '</div>';
$html .= '<div class="control-group" style="float: left; margin-right: 10px;">';
$html .= '<label is="jform_featured-lbl"> '.JText::_('COM_JOMCOMDEV_FIELDSET_PRICE_GROUP').'</label>'.JHtml::_('select.genericlist', JHtml::_('jdcategory.options', 'com_jomestate.price', array('onlyroot' => 0)), $this->name.'[type_id][]', 'value', null, 'text', $d->type_id, true);
$html .= '</div>';
$html .= '<div class="control-group" style="padding-top: 17px;">';
$html .= '<label></label>'.JText::_('COM_JOMCOMDEV_JS_BUTTON_DELETE').'';
$html .= '</div>';
$html .= '</div>';
$html .= '<div class="clr"></div>';
}
}
$html .= '</div>';
return $html;
}
}