Hi Javier,
Here is a solution to change header from screen:
1 Open "Model" interface.
2 Create model with name "mainScreen" and child string "header"
Details: http://prntscr.com/7kmflg/direct
3 Navigate to "index" screen - scope tab and add "mainScreen" variable with type "mainScreen"
Details: http://prntscr.com/7kmg7k/direct
4 Add to Init function following JS code:
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pre
$scope.mainScreen.header = "Header text from index";
/pre
5 Open needed/goal page.
6 Add button to the page.
7 Activate button component. Add "ng-click" attribute with value:
Details: http://prntscr.com/7kmkc3/direct
pre
mainScreen.header = "page header"
/pre
That's all. Now you will change header text to "page header" on this button click.
Regards.