How to Set All Fields Read-Only in Section

// executionContext is passed as function parameter
var formContext = executionContext.getFormContext();

var section = formContext.ui.tabs.get("Summary").sections.get("Details"); 
var controls = section.controls.get();
var controlsLenght = controls.length;
for (var i = 0; i < controlsLenght; i++) { 
	controls[i].setDisabled(true);
}