field of type link in admin form is not rendering value

Question

My class extends from Mage_Adminhtml_Block_Widget_Form, which has declaration for _prepareForm method with code for myfield as follows

  $fieldset->addField('myElementId', 'link', array(
      'label'     => 'myLabel',
      'href' => 'http://magento.stackexchange.com',
      'value'  => 'myElementValue'
    ));

This field is rendering all except value (i.e, myElementValue).

Can any one help me with this?

Billions of Thanks in Advance

EDIT:

My class name - MyNameSpace_MyModule_Block_Adminhtml_MyBlockGroup_ClassExtendingFormContainer_Tab_Form

This class defines the _prepareForm function as follows:

 protected function _prepareForm()
 {
       $form = new Varien_Data_Form();
       $this->setForm($form);
       $fieldset = $form->addFieldset('someElementId',array('key'=>'value'));          

      $fieldset->addField('myElementId', 'link', array(
                      'label'     => 'myLabel',
             'href' => 'http://magento.stackexchange.com/',
              'value'  => 'myElementValue',
            ));

      $fieldset->addField('myElementId2', 'text', array(
                    'label' => 'myLabel2',
                    'name' => 'myElementId2',
             ));

  $dateFormatIso = Mage::app()->getLocale()->getDateTimeFormat(Mage_Core_Model_Locale::FORMAT_TYPE_SHORT);
      $fieldset->addField('myElementId3', 'date', array(
                     'name'   => 'myElementId3',
                     'label'  => 'myLabel3',
                     'width'=>"100px",
                     'image'  => $this->getSkinUrl('images/grid-cal.gif'),
                     'input_format' => Varien_Date::DATE_INTERNAL_FORMAT,
                     'format'       => $dateFormatIso,
                     'time' => true, 
        ));

     if ( Mage::registry('SomeRegistrySetinCurrentControllerAction') )
     {
       $form->setValues(Mage::registry('SomeRegistrySetinCurrentControllerAction')->getData());
 }

 return parent::_prepareForm();
 }

It is rendering date, text fields in the form but not link.

Answer 1

Your code works (almost) correctly.
The value of the link field is not shown because it is overwritten by $form->setValues(...).
Here is how Varien_Data_Form::setValues() works

public function setValues($values)
    {
        foreach ($this->_allElements as $element) { //for each element in the form
            if (isset($values[$element->getId()])) {//if there is a value in the values for the element set the value of that element.
                $element->setValue($values[$element->getId()]);
            }
            else {//if there is no value for the element set its value to null.
                $element->setValue(null);
            }
        }
        return $this;
    }

I recommend using $form->addValues(...); this one does not set to null the missing values in the parameter passed to it.