Sample PS-GUI

[void][reflection.assembly]::LoadWithPartialName("System.Windows.Forms")


$mGUI = new-module -ascustomobject {
    function GuiCreate()
    {
        Param (
            [string]$title,
            [int]$x,
            [int]$y,
            [int]$w,
            [int]$h
        );
        $o = new-object Windows.Forms.Form
        $o.Text = $title
        $o.Left = $x
        $o.Top = $y
        $o.Width = $w
        $o.Height = $h
        return ,$o
    };


    function ButtonCreate()
    {
        Param (
            [string]$text,
            [int]$x,
            [int]$y,
            [int]$w,
            [int]$h,
            [ScriptBlock]$clickFunc
        );
        $o = new-object Windows.Forms.Button
        $o.Text = $text
        $o.Left = $x
        $o.Top = $y
        $o.Width = $w
        $o.Height = $h
        $o.Add_Click($clickFunc)
        return ,$o
    };


    function CtrlAdd()
    {
        Param (
            [PsObject]$oGui,
            [PsObject]$oCtrl
        );
        $oGui.Controls.Add($oCtrl)
    }
}

$gui = $mGUI.GuiCreate('Test', 100, 100, 600, 400)
$btn = $mGUI.ButtonCreate('OK', 100, 100, 50, 25, {$gui.close()})
$mGUI.CtrlAdd($gui, $btn)
$gui.ShowDialog()