PowerShell Windows Forms: Checkbox and Dropdown to CSV - winforms

Question

I have a CSV which I import and I want to add two additional fields and export it to a new file. I want to be able to show a Windows form where the user checks a box to change the FLAG field to Y (unchecked is N) and change the status in a dropdown box if necessary based on the values in $DropDownArray.
My current issue is that the export occurs before I've clicked OK. I understand why, I just don't know where to put the export function ($SAMTemp2), due to the dynamic number of items that will appear in the form.
Additionally, I don't know how to set the default value of the dropdown to a specific choice in the array based on the Status cell in the CSV.
$RowPlus=60
$Next=0
[array]$DropDownArray = "FVR","C","O","P"
Import-Csv $SAMTemp4 | ForEach{
#Service Order Description
$objLabel2 = New-Object System.Windows.Forms.Label
$objLabel2.Location = New-Object System.Drawing.Size(10,$RowPlus)
$objLabel2.Size = New-Object System.Drawing.Size(540,20)
$objLabel2.Text = $_.SO+" "+$_.ProdProj+" ("+$_.SrvcTask+")"
$objForm.Controls.Add($objLabel2)
#Planned/Unplanned Checkbox
$objTypeCheckbox = New-Object System.Windows.Forms.Checkbox
$objTypeCheckbox.Location = New-Object System.Drawing.Size(558,$RowPlus)
$objTypeCheckbox.Size = New-Object System.Drawing.Size(50,20)
#$objTypeCheckbox.Text = "Planned Task"
$objTypeCheckbox.TabIndex = 4
$objForm.Controls.Add($objTypeCheckbox)
#Status Dropdown Box
$DropDown = new-object System.Windows.Forms.ComboBox
$DropDown.Location = new-object System.Drawing.Size(610,$RowPlus)
$DropDown.Size = new-object System.Drawing.Size(50,30)
If($_.Status -eq "Open"){$ST = $Dropdown.Items[3]}
If($_.Status -eq "Closed"){$ST = $Dropdown.Items[2]}
$DropDown.SelectedItem = $ST
$objForm.Controls.Add($DropDown)
ForEach ($s in $DropDownArray) {
[void] $DropDown.Items.Add($s)
}
If($objTypeCheckbox.Checked -eq $true){
$_ | Add-Member -MemberType NoteProperty -Name Flag -Value 'Y'
}Else{
$_ | Add-Member -MemberType NoteProperty -Name Flag -Value 'N'
}
$_ | Add-Member -MemberType NoteProperty -Name COPFVR -Value $Dropdown.selecteditem
$RowPlus+=30
$Next+=1
$_
} | Export-Csv $SAMTemp2 -NoTypeInformation
#This creates the Ok button and sets the event
$OKButton = New-Object System.Windows.Forms.Button
$OKButton.Location = New-Object System.Drawing.Size(120,540)
$OKButton.Size = New-Object System.Drawing.Size(75,23)
$OKButton.Text = "OK"
$OKButton.Add_Click({$empID=$objTextBox1.Text;$sn=$objTextBox2.Text;$gn=$objTextBox3.Text;$email=$objTextBox4.Text;$title=$objDepartmentListbox.SelectedItem;
$office=$objOfficeListbox.SelectedItem;$objForm.Close()})
$OKButton.TabIndex = 9
$objForm.Controls.Add($OKButton)
#This creates the Cancel button and sets the event
$CancelButton = New-Object System.Windows.Forms.Button
$CancelButton.Location = New-Object System.Drawing.Size(195,540)
$CancelButton.Size = New-Object System.Drawing.Size(75,23)
$CancelButton.Text = "Cancel"
$CancelButton.Add_Click({$objForm.Close()})
$CancelButton.TabIndex = 10
$objForm.Controls.Add($CancelButton)
$objForm.Add_Shown({$objForm.Activate()})
[void] $objForm.ShowDialog()
(In case it isn't obvious, I lifted the initial form from a TechNet question, so there are .Add_ functions still in there I didn't adjust.)
https://social.technet.microsoft.com/Forums/scriptcenter/en-US/e3d80f73-55f6-4a7e-95b5-4e9216ef1847/powershell-windows-forms-checkbox?forum=winserverpowershell