Powershell Cancel button Doesn't Call Function - powershell

Question

I have script that creates pop-up with checkbox.
If checkbox is checked and OK is pressed, $districtArray[1] is True
BUT
If checkbox is checked and CANCEL is pressed, $districtArray[1] is ALSO True
I wish that CANCEL button will make entire $districtArray FALSE.
Hence I included function initArray when CANCEL is clicked
$CancelButton.Add_Click({initArray; $Form.Close()})
And here is entire script for reference
$i = $NULL
$districtArray = #()
$highestDistrict = 33
function initArray{
for ($i = 0; $i -lt $highestDistrict; $i++)
{
$script:districtArray += #($false)
}
}
function checkbox_test{
[void] [System.Reflection.Assembly]::LoadWithPartialName("System.Windows.Forms")
[void] [System.Reflection.Assembly]::LoadWithPartialName("System.Drawing")
# Set the size of your form
$Form = New-Object System.Windows.Forms.Form
$Form.width = 500
$Form.height = 200
$Form.Text = ”Select District”
# Set the font of the text to be used within the form
$Font = New-Object System.Drawing.Font("Times New Roman",12)
$Form.Font = $Font
# create your checkbox
$checkbox1 = new-object System.Windows.Forms.checkbox
$checkbox1.Location = new-object System.Drawing.Size(30,30)
$checkbox1.Size = new-object System.Drawing.Size(250,50)
$checkbox1.Text = "01"
$checkbox1.Checked = $false
$Form.Controls.Add($checkbox1)
# Add an OK button
$OKButton = new-object System.Windows.Forms.Button
$OKButton.Location = new-object System.Drawing.Size(130,100)
$OKButton.Size = new-object System.Drawing.Size(100,40)
$OKButton.Text = "OK"
$OKButton.Add_Click({$Form.Close()})
$form.Controls.Add($OKButton)
#Add a cancel button
$CancelButton = new-object System.Windows.Forms.Button
$CancelButton.Location = new-object System.Drawing.Size(255,100)
$CancelButton.Size = new-object System.Drawing.Size(100,40)
$CancelButton.Text = "Cancel"
$CancelButton.Add_Click({initArray; $Form.Close()})
$form.Controls.Add($CancelButton)
########### This is the important piece ##############
# #
# Do something when the state of the checkbox changes #
#######################################################
$checkbox1.Add_CheckStateChanged({
if ($checkbox1.Checked){$districtArray[1] = $true} })
# Activate the form
$Form.Add_Shown({$Form.Activate()})
[void] $Form.ShowDialog()
}
initArray
#Call the function
checkbox_test
write-host "Value of districtArray[1] is" $districtArray[1]