//Angular 4 execute function from another component

 didn't get time to test it but similar solution worked for me. the code created for your need.

Create a service like this

import { Injectable } from '@angular/core';
import { Observable } from 'rxjs/Observable';
import { Subject } from 'rxjs/Subject';

@Injectable()
export class MessageService {
    private _listners = new Subject();

    listen(): Observable {
       return this._listners.asObservable();
    }

    filter(filterBy: string) {
       this._listners.next(filterBy);
    }

}
then implement in your header component like this

// header.component.ts
@Component({
    selector: 'header',
    templateUrl: `
        

            Open filter
        
    `
 })

export class HeaderComponent {
     @Output() onFilter: EventEmitter = new EventEmitter();

     constructor(private _messageService: MessageService){}
     clickFilter():void {
         // this.onFilter.emit('Register click');
         this._messageService.filter('Register click');
     }
 }
then use in your store component like this

@Component({
    selector: 'store',
    template: `

                 Test
              
`
})

export class StoreComponent {
    constructor(private _messageService: MessageService){
        this._messageService.listen().subscribe((m:any) => {
            console.log(m);
            this.onFilterClick(m);
        })
    }

    onFilterClick(event) {
        console.log('Fire onFilterClick: ', event);
    }
 }
The concept is that you can use observable in a service and subscribe in the component where you want it (store.component) and can send event from anywhere in the app like i did in the header.component

I hope it will help you