c# - Hide the icon of main window when navigate to another window -

in wpf application, i've 4 windows. every window, i've written following code minimize system tray. problem when navigate 1 window another, first window's icon still appears in system tray. want hide icon when navigate window? please suggest ways proceed?

my main window code is-

public partial class monthview : metrowindow {      public datetime selecteddate { get; set; }     private system.windows.forms.contextmenu contextmenu1;     private system.windows.forms.menuitem menuitem1;     private system.windows.forms.menuitem menuitem2;      public monthview()     {              initializecomponent();             calmain.displaydate = datetime.today;             globals._globalcontroller = new appcontroller();             globals._globalcontroller.apptaskmanager.setuplocal();             globals._globalcontroller.setmonthviewwindow(this);              globals.ni = new notifyicon();             this.contextmenu1 = new system.windows.forms.contextmenu();             this.menuitem1 = new system.windows.forms.menuitem();             this.menuitem2 = new system.windows.forms.menuitem();             globals.ni.icon = timesheet.properties.resources.monthviewicon;             globals.ni.visible = true;             globals.ni.click +=             delegate(object sender, eventargs args)             {                 this.show();                 this.windowstate = windowstate.normal;              };              this.contextmenu1.menuitems.addrange(new system.windows.forms.menuitem[] { this.menuitem1 });              this.contextmenu1.menuitems.addrange(new system.windows.forms.menuitem[] { this.menuitem2 });              this.menuitem1.text = "start";             this.menuitem2.text = "exit";             globals.ni.contextmenu = this.contextmenu1;     }      protected override void onstatechanged(eventargs e)     {         if (windowstate == system.windows.windowstate.minimized)         {             this.hide();             globals.ni.balloontiptitle = "monthview";             globals.ni.balloontiptext = "this main window";             globals.ni.visible = true;             globals.ni.showballoontip(500);             base.onstatechanged(e);         }     }      public void calitemselecteddate(object sender, selectionchangedeventargs e)     {         datetime d;         if (sender datetime)         {             d = (datetime)sender;         }         else         {             datetime.tryparse(sender.tostring(), out d);         }          selecteddate = d;          showactivity(d);      }      public void showactivity(datetime date)     {         dayview activity = new dayview(date);         activity.show();         this.hide();      }      private void setbutton_click(object sender, routedeventargs e)     {         settingsview set = new settingsview();         set.show();         this.hide();     }   } 

why not have windows share 1 notifyicon? can switch notifyicon's icon when switch views. have global "singleton" holding onto it.

creating new icon each screen means there 4 icons there, , since walk on static reference, no longer have access notifyicon.