When selecting/deselecting at the top-level item in a CN, it will do select/deselect of all of its children that are released. This process may take longer for top-level item with many children. At present, the CN page freezes during the action, but eventually finishes the process.
To be more clear on the process to the users, it would be nice to have an UI indication (e.g. prompts message) stating that "Select/Deselect all is being processed".
