Close parent windows from loading url

[muhammadantoniussony]

Greeting,

Number 1 :

I've load url to a create window on desktop using this code :

    [DirectMethod(ShowMask = true)]
    public void createwinappme(string idmn, string wtitle, string waction, int wheight, int wwidth)
    {
        Desktop.GetInstance().CreateWindow(new Window
        {
            ID = idmn,
            Height = wheight,
            Width = wwidth,
            Maximizable = false,
            Resizable = false,
            Title = wtitle,
            Icon = Icon.TableGear,
            CloseAction = CloseAction.Destroy,
            Modal = false,
            Layout = "FitLayout",
            Loader = new ComponentLoader
            {
                Url= waction,
                Mode = LoadMode.Frame,
                LoadMask =
                {
                    ShowMask = true
                }
            }

        });
    }

idmn --> the created windows ID
waction ---> loading url

on the waction i've put button to close the windows parent

                        <ext:Button ID="btnClose" runat="server" AutoPostBack="false" Text="Exit" Icon="DoorOpen">
                            <Listeners>
                                <Click Handler=" " />
                            </Listeners>
                        </ext:Button>

Is there any solution to close parent windows using button on loading url ...???

Number 2 :

I've try to hide desktop start button using this code :

<Listeners>
   <Ready Handler="Ext.get('ux-taskbar-start').addClass('x-hide-display');" />
</Listeners>

but i've got my desktop blank like below



Is there any solution to hide start button ... ??

Thank you ...