addToolbar in joomla 3.0 - toolbar

Question

Added toolbar in joomla 3.0 html.php file. When the addNew button is clicked it displays
An error has occurred. 0 Invalid controller:
name='Comboscategories', format=''
html.php file as follows.
<?php
defined( '_JEXEC' ) or die( 'Restricted access' );
class ComboscategoriesViewsStatisticsHtml extends JViewHtml
{
function render()
{
$app = JFactory::getApplication();
//retrieve task list from model
$model = new ComboscategoriesModelsStatistics();
$this->stats = $model->getStats();
$this->addToolbar();
/*$this->displayComboslist();*/
//display
return parent::render();
}
protected function addToolbar()
{
$canDo = ComboscategoriesHelpersLendr::getActions();
// Get the toolbar object instance
$bar = JToolBar::getInstance('toolbar');
JToolbarHelper::title(JText::_('Combos Category'));
JToolBarHelper::addNew('Comboscategories.add');
/* JToolbarHelper::preferences('com_comboscategories');*/
JToolBarHelper::save();
JToolBarHelper::cancel();
JToolBarHelper::deleteList();
JToolBarHelper::publishList();
JToolBarHelper::unpublishList();
}
}
controller.php(display.php)
<?php
defined( '_JEXEC' ) or die( 'Restricted access' );
class ComboscategoriesControllersDisplay extends JControllerBase
{
public function execute()
{
// Get the application
$app = $this->getApplication();
// Get the document object.
$document = JFactory::getDocument();
$viewName = $app->input->getWord('view', 'statistics');
$viewFormat = $document->getType();
$layoutName = $app->input->getWord('layout', 'default');
$app->input->set('view', $viewName);
// Register the layout paths for the view
$paths = new SplPriorityQueue;
$paths->insert(JPATH_COMPONENT . '/views/' . $viewName . '/tmpl', 'normal');
$viewClass = 'ComboscategoriesViews' . ucfirst($viewName) . ucfirst($viewFormat);
$modelClass = 'ComboscategoriesModels' . ucfirst($viewName);
$view = new $viewClass(new $modelClass, $paths);
$view->setLayout($layoutName);
// Render our view.
echo $view->render();
return true;
}
}
I searched related to this but i dont find the solution. kindly help me to sort this

Answer 1

Hi im new to joomla but i think that your classes have bad names. it Should be ComboscategoriesViewStatisticsHtml or ComboscategoriesControllerDisplay

Answer 2

You have to use the name of the model: if you have a controller called ComboscategoriesControllersDisplay your call should be JToolBarHelper::addNew('display.add').
Best read this: http://docs.joomla.org/J3.x:Developing_a_MVC_Component/Adding_backend_actions