diff --git a/src/app/services/XAService.service.ts b/src/app/services/XAService.service.ts
index a4194cc..990841c 100644
--- a/src/app/services/XAService.service.ts
+++ b/src/app/services/XAService.service.ts
@@ -6,12 +6,10 @@ import { Injectable } from '@angular/core';
 })
 export class XAService {
 
-    // private selectedXA = new BehaviorSubject<string>(null);
-    // xa$ = this.selectedXA.asObservable();
+    private selectedXA = new BehaviorSubject<string>(null);
+    xa$ = this.selectedXA.asObservable();
 
-    selectedXA: string;
-
-    changeXA(xa: string) {
-        this.selectedXA = xa;
+    changeXA(newXA: string) {
+        this.selectedXA.next(newXA);
     }
 }