Activate button upon checkbox selection in custom ribbon

Hi everyone,

Please find the attached excel macro file, where I have two Samples for checkbox and their depending button's action
In the Checkboxes Sample 2", I have two enabled checkboxes and a button which is disabled.

Please help me to fix the program as below:
1.) If both checkboxes are unchecked, then button should be disabled. If any checkbox is marked, then button should be enabled, so the user can click on it to run the codes.

2.) Whenever user opens this macro workbook, then I want to make sure that both the checkboxes are unmarked and button is also disabled.

3.) Whenever user opens this macro workbook, then I want to activate the "Checkboxes" tab in the ribbon.

I am using Excel 2013 and 2010.


Note - I have found something similar on another thread as below (for above point# 1), but I want to keep the button disabled until user not select any checkbox.
http://www.excelforum.com/excel-prog...h-a-macro.html

Thank you in advance!

With Regards,
SunOffice