Restore minimized frameless window from Taskbar

[praveen_03]

I'm creating one basic qml application with visibility:"FullScreen", and I have one button to minimize the application but after minimizing if i click on the exe in task bar its coming with framed application with min, max, close. I want it again in FullScreen mode.

import QtQuick 2.2
import QtQuick.Window 2.2

applicationWindow
{
id:mainWindow
visible: true
visibility: "FullScreen"
Rectangle {
       width: 140
       height: 140
       color: "lightblue"

   }
  Button{
    anchors.right: parent.right
    onClicked: {
        mainWindow.showMinimized()
    }
  }
}