$ui.BTN_Ping.Add_Click({

        $ui.Grid_Output_Computer.Columns | ForEach { $_.CanUserSort = $True }

        $ui.Grid_Output_Computer.Dispatcher.Invoke('Normal', [action] {
                [void]$collection.observableCollection.clear()
            })

        $ui.PB_Computers.Value = [int] "0"

        $ps = [powershell]::Create().AddScript({
                Param ($Collection, $ui, $jobs)
                $RunspacePool = [runspacefactory]::CreateRunspacePool(1, 5)

                $ScriptBlock = {
                    Param ($ui, $Collection, $server)

                    $status = "" ;
                    $t = "" ;
                    $IP = "" ;

                    $t = Test-Connection $server -count 1

                    $status = "OFFline"
                    if ($t2) { $status = "ONline" }

                    $IP = "N/A"
                    if ($t) { $IP = $t.IPV4Address.ToString() }

                    $Object = [pscustomobject][ordered]@{
                        Date         = (Get-Date).ToString() ;
                        Computername = $server ;
                        IP           = $IP ;
                        Status       = $status ;
                    }

                    Start-Sleep -Seconds 1

                    $ui.Grid_Output_Computer.Dispatcher.Invoke('Normal', [action] {
                            [void]$collection.observableCollection.Add($Object)
                            #$ui.Grid_Output_Computer.Columns | ForEach-Object { $_.CanUserSort = $True }
                            $ui.PB_Computers.Value++
                        })

                    # <# ok  only for 1 offline
                    $ui.Grid_Output_Computer.Dispatcher.Invoke('Normal', [action] {
                            $myRow = $ui.Grid_Output_Computer.ItemContainerGenerator.ContainerFromIndex( $ui.Grid_Output_Computer.Items.status.IndexOf("OFFline") )
                            $myRow.Background = ([System.Windows.Media.Brushes]::Red)
                        })
                    ##>


                    $ui.Grid_Output_Computer.Columns | ForEach-Object { $_.CanUserSort = $True }

                    <#  ok if 1 offline

                               if ($ui.Grid_Output_Computer.Items.status.Contains("OFFline"))  {
                                  $index = $ui.Grid_Output_Computer.Items.status.IndexOf("OFFline")
                                  $myRow = $ui.Grid_Output_Computer.ItemContainerGenerator.ContainerFromIndex($index)
                                  }
                                  $ui.Grid_Output_Computer.Dispatcher.Invoke('Normal',[action]{
                                  $myRow.Background = ([System.Windows.Media.Brushes]::Red)
                                  })
#>

                    <#  ok only for 1 offline

                     $off = @($ui.Grid_Output_Computer.Items.status.Contains("OFFline"))
                     if ($off) {
                     $ui.Grid_Output_Computer.Items.status.ForEach("OFFline")
                                                    $index = $ui.Grid_Output_Computer.Items.status.IndexOf("OFFline")
                                                    $myRow = $ui.Grid_Output_Computer.ItemContainerGenerator.ContainerFromIndex($index)
                                                    $ui.Grid_Output_Computer.Dispatcher.Invoke('Normal',[action]{
                                                    $myRow.Background = ([System.Windows.Media.Brushes]::Red)
                                                    #$myRow.Background = ([System.Windows.Media.Brushes]::Green)
                                                    })

                    }

#>


                }

                $servers = ($ui.LV_Selected_Computers.Items).name
                ForEach ($server in $servers) {
                    #$throttle = [int] "3"
                    # 1..$throttle | foreach {

                    $ps = [powershell]::Create()
                    $ps.RunspacePool = $RunspacePool
                    $RunspacePool.Open()
                    [void]$ps.AddScript($ScriptBlock).AddArgument($ui).AddArgument($Collection).AddArgument($server)
                    [void]$jobs.Add([pscustomobject]@{
                            PowerShell = $Ps
                            Handle     = $PS.BeginInvoke()
                        })
                }
            }).AddArgument($Collection).AddArgument($ui).AddArgument($jobs).AddArgument($server)

        [System.Threading.Monitor]::Enter($Jobs.syncroot)
        $jobs.Add([pscustomobject]@{
                PowerShell = $ps
                Handle     = $Ps.BeginInvoke()
            })
        [System.Threading.Monitor]::Exit($Jobs.syncroot)
    })