diff --git a/@overflow/commons/ui/component/primeng/popup-panel.component.ts b/@overflow/commons/ui/component/primeng/popup-panel.component.ts
index 31a61e4..dc00d7a 100644
--- a/@overflow/commons/ui/component/primeng/popup-panel.component.ts
+++ b/@overflow/commons/ui/component/primeng/popup-panel.component.ts
@@ -38,7 +38,7 @@ export class PopupPanelComponent implements OnDestroy {
 
   @ViewChild('container') containerViewChild: ElementRef;
 
-  private readonly popup = true;
+  readonly popup = true;
 
   container: HTMLDivElement;
 
diff --git a/@overflow/commons/ui/component/window/title-bar.component.ts b/@overflow/commons/ui/component/window/title-bar.component.ts
index 9bd0025..1f2b195 100644
--- a/@overflow/commons/ui/component/window/title-bar.component.ts
+++ b/@overflow/commons/ui/component/window/title-bar.component.ts
@@ -6,10 +6,10 @@ import { Component, OnInit } from '@angular/core';
 })
 export class TitleBarComponent implements OnInit {
 
-  private style: string;
-  private titleBarClass: string;
-  private showTopResize: boolean;
-  private showLeftResize: boolean;
+  style: string;
+  titleBarClass: string;
+  showTopResize: boolean;
+  showLeftResize: boolean;
 
   constructor(
   ) { }
@@ -17,6 +17,6 @@ export class TitleBarComponent implements OnInit {
   ngOnInit() {
   }
 
-  onTitlebarDoubleClick() {
+  onTitlebarDoubleClick(event) {
   }
 }
diff --git a/@overflow/commons/ui/component/window/window-controls.component.html b/@overflow/commons/ui/component/window/window-controls.component.html
index 0353b16..2fce396 100644
--- a/@overflow/commons/ui/component/window/window-controls.component.html
+++ b/@overflow/commons/ui/component/window/window-controls.component.html
@@ -4,7 +4,7 @@
   </svg>
 </button>
 <ng-container [ngSwitch]="windowState">
-  <button *ngSwitchCase="maximized" aria-label="restore" tabindex="-1" class="window-control restore" (click)="onRestore($event)">
+  <button *ngSwitchCase="'maximized'" aria-label="restore" tabindex="-1" class="window-control restore" (click)="onRestore($event)">
     <svg aria-hidden="true" version="1.1" width="10" height="10">
       <path d="m 2,1e-5 0,2 -2,0 0,8 8,0 0,-2 2,0 0,-8 z m 1,1 6,0 0,6 -1,0 0,-5 -5,0 z m -2,2 6,0 0,6 -6,0 z" />
     </svg>
diff --git a/@overflow/commons/ui/component/window/window-controls.component.ts b/@overflow/commons/ui/component/window/window-controls.component.ts
index 66297f0..e77f081 100644
--- a/@overflow/commons/ui/component/window/window-controls.component.ts
+++ b/@overflow/commons/ui/component/window/window-controls.component.ts
@@ -7,7 +7,7 @@ import { ipcRenderer, remote } from 'electron';
 })
 export class WindowControlsComponent implements OnInit {
 
-  private windowState: string;
+  windowState: string;
 
   constructor(
   ) { }
@@ -15,19 +15,19 @@ export class WindowControlsComponent implements OnInit {
   ngOnInit() {
   }
 
-  onMinimize() {
+  onMinimize(event) {
     remote.getCurrentWindow().minimize();
   }
 
-  onRestore() {
+  onRestore(event) {
     remote.getCurrentWindow().unmaximize();
   }
 
-  onMaximize() {
+  onMaximize(event) {
     remote.getCurrentWindow().maximize();
   }
 
-  onClose() {
+  onClose(event) {
     remote.getCurrentWindow().close();
   }