protected function getInput()
	{
		// Initialize variables.
		$html = array();
		$attr = '';

		// Initialize some field attributes.
		$attr .= $this->element['class'] ? ' class="combobox ' . (string) $this->element['class'] . '"' : ' class="combobox"';
		$attr .= ((string) $this->element['readonly'] == 'true') ? ' readonly="readonly"' : '';
		$attr .= ((string) $this->element['disabled'] == 'true') ? ' disabled="disabled"' : '';
		$attr .= $this->element['size'] ? ' size="' . (int) $this->element['size'] . '"' : '';

		// Initialize JavaScript field attributes.
		$attr .= $this->element['onchange'] ? ' onchange="' . (string) $this->element['onchange'] . '"' : '';

		// Get the field options.
		$options = $this->getOptions();

		// Load the combobox behavior.
		Behavior::combobox();

		// Build the input for the combo box.
		$html[] = '<input type="text" name="' . $this->name . '" id="' . $this->id . '"' . ' value="' . htmlspecialchars($this->value, ENT_COMPAT, 'UTF-8') . '"' . $attr . '/>';

		// Build the list for the combo box.
		$html[] = '<ul id="combobox-' . $this->id . '" style="display:none;">';
		foreach ($options as $option)
		{
			$html[] = '<li>' . $option->text . '</li>';
		}
		$html[] = '</ul>';

		return implode($html);
	}