-import { Component, OnInit} from '@angular/core';
-import { XappMgrService } from '../services/xapp-mgr/xapp-mgr.service';
-import { ConfirmDialogService } from './../services/ui/confirm-dialog.service'
-import { NotificationService } from './../services/ui/notification.service'
+import { Component, OnInit, ViewChild } from '@angular/core';
+import { MatSort } from '@angular/material/sort';