Powershell forms resizing

Add-Type -AssemblyName System.Windows.Forms
Add-Type -AssemblyName System.Drawing
[System.Windows.Forms.Application]::EnableVisualStyles()

$Form = New-Object system.Windows.Forms.Form
$Form.ClientSize = '500,230'
$Form.text = "Some title"
$Form.StartPosition = 'CenterScreen'

$Button1 = New-Object System.Windows.Forms.Button
# $Button1.Location = New-Object System.Drawing.Point(200,150)
# $Button1.Size = New-Object System.Drawing.Size(100,50)
$Button1.Text = "START"
$Button1.Anchor = [System.Windows.Forms.AnchorStyles]::Top `
-bor [System.Windows.Forms.AnchorStyles]::Bottom `
-bor [System.Windows.Forms.AnchorStyles]::Left `
-bor [System.Windows.Forms.AnchorStyles]::Right


$ListBox1 = New-Object system.Windows.Forms.ListBox
$ListBox1.text = "listBox"
# $ListBox1.location = New-Object System.Drawing.Point(50,50)
# $ListBox1.size = New-Object System.Drawing.Size(50,50)
$ListBox1.Anchor = [System.Windows.Forms.AnchorStyles]::Top `
-bor [System.Windows.Forms.AnchorStyles]::Bottom `
-bor [System.Windows.Forms.AnchorStyles]::Left `
-bor [System.Windows.Forms.AnchorStyles]::Right

$tableLayoutPanel1 = New-Object System.Windows.Forms.TableLayoutPanel
$tableLayoutPanel1.RowCount = 2
$tableLayoutPanel1.ColumnCount = 2
# $tableLayoutPanel1.SetColumnSpan($Button1,2)
#$tableLayoutPanel1.SetRowSpan($Button1,2)
$tableLayoutPanel1.Controls.Add($Button1, 0, 0)
$tableLayoutPanel1.Controls.Add($ListBox1, 1, 1)
$tableLayoutPanel1.Dock = [System.Windows.Forms.DockStyle]::Fill
$tableLayoutPanel1.RowStyles.Add((new-object System.Windows.Forms.RowStyle([System.Windows.Forms.SizeType]::Percent, 50)))
$tableLayoutPanel1.RowStyles.Add((new-object System.Windows.Forms.RowStyle([System.Windows.Forms.SizeType]::Percent, 50)))
$tableLayoutPanel1.ColumnStyles.Add((new-object System.Windows.Forms.ColumnStyle([System.Windows.Forms.SizeType]::Percent,50)))
$tableLayoutPanel1.ColumnStyles.Add((new-object System.Windows.Forms.ColumnStyle([System.Windows.Forms.SizeType]::Percent,50)))

$Form.controls.AddRange(@($tableLayoutPanel1))
$Form.ShowDialog()