Powershell: Event handlers registered via Register-ObjectEvent don't fire immediately - only after my dialog closes - powershell

Question

I have a question regarding event handlers (Register-ObjectEvent). Here's my code:
Import-Module "$PSScriptRoot\Lib\Ookii.Dialogs.Winforms.dll"
$OKButton = [Ookii.Dialogs.WinForms.TaskDialogButton]("Ok")
$NOButton = [Ookii.Dialogs.WinForms.TaskDialogButton]("No")
$CancelButton = [Ookii.Dialogs.WinForms.TaskDialogButton]("Cancel")
$HelpButton = [Ookii.Dialogs.WinForms.TaskDialogButton]("Help")
$OokieTaskDialog = New-Object Ookii.Dialogs.WinForms.TaskDialog
$OokieTaskDialog.Buttons.Add($OKButton)
$OokieTaskDialog.Buttons.Add($NOButton)
$OokieTaskDialog.Buttons.Add($CancelButton)
$OokieTaskDialog.Buttons.Add($HelpButton)
$OokieTaskDialog.MainInstruction = "Main Instruction"
$OokieTaskDialog.Content = "Eiusmod cupidatat amet officia ut cillum anim proident. Aliqua aliqua ullamco reprehenderit velit est eiusmod et aute."
$OokieTaskDialog.ExpandedInformation = "Wozarlov, Marvin Houston, [phone]"
$OokieTaskDialog.Footer = "This is the footer text More Info"
$OokieTaskDialog.FooterIcon = [Ookii.Dialogs.WinForms.TaskDialogIcon]::Information
$OokieTaskDialog.EnableHyperlinks = $true
Register-ObjectEvent -InputObject $OokieTaskDialog -EventName HyperlinkClicked -Action { Write-Host "Link Clicked" }
$OokieTaskDialog.WindowTitle = "Window Title"
$OokieTaskDialog.Width = 300
$OokieTaskDialog.AllowDialogCancellation = $true
$OokieTaskDialog.MainIcon = [Ookii.Dialogs.WinForms.TaskDialogIcon]::Warning
$Result = $OokieTaskDialog.ShowDialog((New-Object System.Windows.Forms.Form -Property #{TopMost = $true}))
$Result
Specifically: Register-ObjectEvent -InputObject $OokieTaskDialog -EventName HyperlinkClicked -Action { Write-Host "Link Clicked" }
The event handler works, but it only displays the results ("Link Clicked") AFTER the dialog has closed. How do I get an event handler to respond immediately when the trigger conditions have been met?
For instance, if I click the hyperlink in the footer 10 times, and then click the OK button, the console prints "Link Clicked" 10 times.
I want to print "Link Clicked" immediately when the hyperlink is clicked.
How can I register an event that fires immediately? What am I doing wrong?

Answer 1

ShowDialog run on the same thread than the listener created through Register-ObjectEvent. It won't process anything until the dialog is closed.
To have a script block directly handle a .NET event, call the object's Add-Event() method.
$OokieTaskDialog.Add_HyperlinkClicked({ Write-Host "Link Clicked" })
Additional references:
This mklement0 excellent answer: How to add an Event Action handler in Powershell
Excerpt
C# offers syntactic sugar in the form of operators += and -= for
attaching and detaching event-handler delegates, which look like
assignments, but are in reality translated to add_() and
remove_() method calls.
PowerShell offers no such syntactic sugar for attaching/removing event
handlers, so the methods must be called directly.
This very complete answer by iRon: Powershell: Job Event Action with Form not executed
Excerpt:
Even if there are
multiple threads setup, there are two different 'listeners' in one
thread. When your script is ready to receive form events (using
ShowDialog or DoEvents) it can’t listen to .NET events at the same
time. And visa versa
Both of these answers provide a lot more insights and references links themselves.