Calling a model from another model?

[eluser]mattalexx[/eluser]
[quote author="Tomas Sundvall" date="1214206315"]Have you try to just load the model in the constructor, and then use it the same way as if it was in a controller?[/quote]
Yes, but it didn't work:

Code:

// Get item_images
$this->load->model('Item_Image_model');
$select = $this->Item_Image_model->get_select(); // <-- Undefined property: Item_model::$item_image_model