Many a times we need to know why some of the ribbon buttons are not visible or hidden. Recently microsoft has introduced new feature where we can directly debug ribbon from CRM form.
To debug ribbon button on CRM form we need to add below parameter in CRM querystring URL.
once you add above parameter and click on enter, new button will be visible under eclipse(…) Command Checker. Clicking on Command Checker, below pop window will open.
As you can see above for each ribbon button window will give you option to see Enable rule, Display Rules and Action.
More details can be found in link below.
Hope this helps!