Problems setting up adminhtml layout xml in magento
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I've been working on getting a new form in the adminhtml for my Magento module. I'm running into a serious issue with actually loading blocks, however. I can load a test block (using a phtml layout) using this code I found in a different stack overflow question (I implement this in the adminhtml controller):

        $block = $this->getLayout()->createBlock('coupsmart_coupon/adminhtml_forms');
        error_log('The block:' . var_export($block, true));
        if($block)
        {
        	$block->setTemplate('test/test.phtml');
        	error_log(var_export($block->getTemplate(), true));
        	error_log('The HTML:');
        	error_log(var_export($block->toHtml(),true));   
        }
Using a test block, I get back the correct html (found in my adminhtml/default/default/template folder).

However, when I instantiate a grid_container block, it it doesn't run the `if($block){}` portion, because the block is false. But in my block class for the grid_container, I have a `__constructor()` method where I log an output, so it is running the constructor, which means my class instantiation (and naming) is correct. 

What can cause a constructor to run on a block but have it still return false, for an `Mage_Adminhtml_Block_Widget_Grid_Container` class?

If any more code is needed (controller, grid_container block, grid block, config, etc.) is needed, let me know, and I'll post it up. I just didn't want to overwhelm with a code overflow that may dilute the question.