PowerShell and Windows Forms Tooltip custom colour - winforms

Question

I'm trying to customise a simple tooltip with a black background (and black border if possible) and white text. I have the following code, but at the moment it's flakey, sometimes works, other times doesn't.
Can somebody please advise how to make this more reliable? Thanks.
[void][System.Reflection.Assembly]::LoadWithPartialName("System.Windows.Forms")
[void][System.Reflection.Assembly]::LoadWithPartialName("System.Drawing")
[System.Windows.Forms.Application]::EnableVisualStyles()
Add-Type -AssemblyName System.Drawing
#create form
$form = New-Object System.Windows.Forms.Form
$shutdownBtn = New-Object System.Windows.Forms.Button
$shutdownBtn.Size = New-Object System.Drawing.Size(200, 40)
$shutdownBtn.Text = "Shut down"
$form.Controls.Add($shutdownBtn)
$tooltip2 = New-Object System.Windows.Forms.ToolTip
$tooltip2.SetToolTip($shutdownBtn, "Shut down.")
$tooltip2.OwnerDraw = $true
$tooltip2.Add_Draw($tooltip2_Draw)
$tooltip2_Draw=[System.Windows.Forms.DrawToolTipEventHandler]{
$fontstyle = New-Object System.Drawing.Font("Segoe UI", 9, [System.Drawing.FontStyle]::Normal)
$format = [System.Drawing.StringFormat]::GenericTypographic
$myBrush1 = new-object Drawing.SolidBrush White
$_.Graphics.DrawString($_.ToolTipText, $fontstyle, $myBrush1, $_.Bounds.X, $_.Bounds.Y, $format)
$myBrush2 = new-object Drawing.SolidBrush Black
$_.Graphics.FillRectangle($myBrush2, $_.Bounds)
$_.DrawBackground()
$_.DrawBorder()
$_.DrawText()
}
$form_cleanup =
{
$tooltip2.Remove_Draw($tooltip2_Draw)
$form.remove_FormClosed($form_cleanup)
}
$form.add_FormClosed($form_cleanup)
[void]$form.ShowDialog()
$form.Dispose()

Answer 1

I'll answer my own question:
There were a couple of glaring errors from a tired mind. Firstly:
$tooltip2.Add_Draw($tooltip2_Draw)
should have been called after I declared
$tooltip2_Draw
Secondly, I needed to call
FillRectangle
before i called
DrawString
And finally, since I set OwnerDraw = $true I didn't need to call:
$_.DrawBackground()
$_.DrawBorder()
$_.DrawText()
So here is the solution:
[void][System.Reflection.Assembly]::LoadWithPartialName("System.Windows.Forms")
[void][System.Reflection.Assembly]::LoadWithPartialName("System.Drawing")
[System.Windows.Forms.Application]::EnableVisualStyles()
Add-Type -AssemblyName System.Drawing
#create form
$form = New-Object System.Windows.Forms.Form
$shutdownBtn = New-Object System.Windows.Forms.Button
$shutdownBtn.Size = New-Object System.Drawing.Size(200, 40)
$shutdownBtn.Text = "Shut down"
$form.Controls.Add($shutdownBtn)
$tooltip2 = New-Object System.Windows.Forms.ToolTip
$tooltip2.SetToolTip($shutdownBtn, "Shut down now.")
$tooltip2.OwnerDraw = $true
$tooltip2_Draw=[System.Windows.Forms.DrawToolTipEventHandler]{
$fontstyle = new-object System.Drawing.Font('Microsoft Sans Serif', 16, [System.Drawing.FontStyle]::Regular)
$format = [System.Drawing.StringFormat]::GenericTypographic
$format.LineAlignment = [System.Drawing.StringAlignment]::Center;
$format.Alignment = [System.Drawing.StringAlignment]::Center;
$whiteBrush = new-object Drawing.SolidBrush White
$blackBrush = new-object Drawing.SolidBrush Black
$_.Graphics.FillRectangle($blackBrush, $_.Bounds)
$_.Graphics.DrawString($_.ToolTipText, $fontstyle, $whiteBrush, ($_.Bounds.X + ($_.Bounds.Width/2)), ($_.Bounds.Y + ($_.Bounds.Height/2)), $format)
}
$tooltip2.Add_Draw($tooltip2_Draw)
$form_cleanup =
{
$tooltip2.Remove_Draw($tooltip2_Draw)
$form.remove_FormClosed($form_cleanup)
}
$form.add_FormClosed($form_cleanup)
[void]$form.ShowDialog()
$form.Dispose()