I created one small example that helps you understand better how you can control other buttons with one.
In the example, you have 3 buttons that increase value 1 if you click on the button. But if you click on one control button all values will be increased in all fields. (click in control button has to affect on another 3 buttons).
Code you can find in Advanced of the element button in section Action(Scroll down to the section action.)
Please download->unzip->and install it (BF->Configuration->Package Installer->select this xml file->Install Package).
If this didn't help you understand how to control other buttons, not matter, send me login access as described in the comment above and I will help you!