Forms in PowerShell: clear checkedlistbox items when "select all" is deselected

Question

Hello all,
I recently got help to add a "select all" checkbox to my checkedlistbox, and it works great. However, I'd like to have it also work where, when the "select all" checkbox is consequently unchecked, it clears all the checkboxes. Is this
easy to do, or would it be easier to just have an "unselect all" checkbox? Code is as follows:
[void][system.reflection.assembly]::LoadWithPartialName("System.Drawing")
[void][System.Reflection.Assembly]::LoadWithPartialName("System.Windows.Forms")
$objForm = New-Object System.Windows.Forms.Form
$objForm.Text = "Test"
$objForm.Size = New-Object System.Drawing.Size(700,300)
$objForm.StartPosition = "CenterScreen"
$CheckedListBox = New-Object System.Windows.Forms.CheckedListBox
$CheckedListBox.Location = New-Object System.Drawing.Size(20,20)
$CheckedListBox.size = New-Object System.Drawing.Size(300,100)
$CheckedListBox.CheckOnClick = $true
$CheckedListBox.Items.Add("Select All") > $null
$CheckedListBox.Items.AddRange(1..20)
$CheckedListBox.ClearSelected()
$CheckedListBox.Add_click({
If($this.selecteditem -eq 'Select All'){
For($i=1;$i -lt $CheckedListBox.Items.Count; $i++){
$CheckedListBox.SetItemChecked($i,$true)
$objForm.Controls.Add($CheckedListBox)
$Form = $objForm.ShowDialog()

Answer 1

Rhys,
Can you explain the $checkedlistbox.checkeditems[0] part? are you looking at the first item in the checkedlistbox object, or what is the .checkeditems[0] part referring to?
Boe,
Is this also what your code is referring to when you say $this.getitemcheckstate(0) ?
The [0] refers to the first item in the listcheckedbox (which in this case is the 'Select All' item) and checks to see if it is checked or not. Rhys's example looks at the first item in the array of checked items ('Select All' would always be the first if checked
and wouldn't exist if it was unchecked).
Boe Prox
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