How to add items to nativescript actionbar programmatically? -

how programmatically add items actionbar? i've been trying play around code below action items never update.

public setactionbaritems(actionbar: actionbar) {         let tab = tabfactory.gettab(this.currenttabindex);         let actionitem = new actionitem();         actionitem.set("ios.systemicon", "12");         actionitem.set("ios.position", "right");         actionitem.set("android.systemicon", "ic_menu_search");         actionitem.set("android.position", "right");         actionbar.actionitems.additem(actionitem);          // (let actionitem of tab.actionitems) {         //     actionbar.actionitems.additem(actionitem);         // }     } 

do perhaps need tell view somehow update itself? tried setting actionitems="{{actionbaritems}}" on actionbar itself, throws warning property read-only.

not proud of right here possible solution. refactor in future.

view model

export class mainviewmodel extends observable {     public isarticleslisttabvisible : boolean;     public isarchivetabvisible : boolean;     public isaccounttabvisible : boolean;      public items: array<bottombaritem> = [         new bottombaritem(0, "archive", "ic_archive_black", "#ff303030"),         new bottombaritem(1, "my list", "ic_list_black", "#ff303030"),         new bottombaritem(2, "account", "ic_account_circle_black", "#ff303030")     ];      constructor() {         super();     }      title() : string {         return "my list";     }      public setactionbartitle(tab: itab) {         this.notifypropertychange("title", tab.title);     }      public setactionbaritems(currenttab: itab) {         if (currenttab instanceof articleslisttab) {             this.isarticleslisttabvisible = true;             this.isaccounttabvisible = false;             this.isarchivetabvisible = false;         }         else if (currenttab instanceof accounttab) {             this.isaccounttabvisible = true;             this.isarticleslisttabvisible = false;             this.isarchivetabvisible = false;         }         else {             this.isarchivetabvisible = true;             this.isarticleslisttabvisible = false;             this.isaccounttabvisible = false;         }          this.notifypropertychange("isarticlestabvisible", this.isarticleslisttabvisible);         this.notifypropertychange("isaccounttabvisible", this.isaccounttabvisible);         this.notifypropertychange("isarchivetabvisible", this.isarchivetabvisible);     } } 

xml file

<actionbar title="{{ title }}" class="action-bar" id="mainactionbar">             <actionitem tap="{{onsearch}}"                  ios.systemicon="12" ios.position="right"                 android.systemicon="ic_menu_search" android.position="right" visibility="{{isarticleslisttabvisible ? 'visible' : 'collapsed'}}"/>             <actionitem tap="{{onarticlesfilter}}"                 ios.systemicon="10" ios.position="right"                 android.systemicon="ic_menu_sort_by_size" android.position="popup" text="newest" visibility="{{isarticleslisttabvisible ? 'visible' : 'collapsed'}}"/>              <actionitem tap="{{onarticlesfilter}}"                 ios.systemicon="10" ios.position="right"                 android.systemicon="ic_menu_sort_by_size" android.position="popup" text="oldest" visibility="{{isarticleslisttabvisible ? 'visible' : 'collapsed'}}"/>                 <actionitem tap="{{onarticlesfilter}}"                 ios.systemicon="10" ios.position="right"                 android.systemicon="ic_menu_sort_by_size" android.position="popup" text="most progress" visibility="{{isarticleslisttabvisible ? 'visible' : 'collapsed'}}"/>              <actionitem tap="{{onarticlesfilter}}"                 ios.systemicon="10" ios.position="right"                 android.systemicon="ic_menu_sort_by_size" android.position="popup" text="least progress" visibility="{{isarticleslisttabvisible ? 'visible' : 'collapsed'}}"/>          </actionbar> 

code behind

export function onbottombarloaded(args: eventdata) {     this._bottombar = args.object bottombar;     this._bottombar.selectitem(1);      this._bottombar.on('tabselected', (args) => {         switchbottombartab(args.newindex, args.oldindex);         let currenttab = tabfactory.gettab(args.newindex);          _model.setactionbartitle(currenttab);         _model.setactionbaritems(currenttab);     }); }