Multiple radio button (2 groups) popup options with Powershell

I need help with a powershell script.  I am missing 2 features that I cannot figure how to write.  On 1 popup form, I'd like (using radio buttons) two sets of choices and have them spit out 2 variables.  Like this:

Choice 1:
Blue
Green
Red

Choice 2:
Car
Truck
Motorcycle

Results:
Blue Car


My code below will create 1 set of options, now how do I create a second set?  Finally, I'd also like to have a default options radio button selected, any help?  Like set the default radio to Car & blue?

[VOID][Reflection.Assembly]::LoadWithPartialName("System.Windows.Forms") 
 
# create form
$form = New-Object Windows.Forms.Form
$form.text = "What do you want to do?"
$form.top = 10
$form.left = 10
$form.height = 130
$form.width = 275
 
# create label
$label = New-Object Windows.Forms.Label
$label.text = "Select a button"
$label.height = 30
$label.width = 75
$label.top = 2
$label.left = 25
$form.controls.add($label)
 
# create radiobutton
$RadioButton = New-Object Windows.Forms.radiobutton
$RadioButton.text = "Button Text"
$RadioButton.height = 20
$RadioButton.width = 150
$RadioButton.top = 2
$RadioButton.left = 100
$form.controls.add($RadioButton)
 
 
# create radiobutton1
$radiobutton1 = New-Object Windows.Forms.radiobutton
$RadioButton1.text = "Button Text1"
$RadioButton1.height = 20
$RadioButton1.width = 150
$RadioButton1.top = 30
$RadioButton1.left =100
$form.controls.add($RadioButton1)
 
 
# create event handler for button
$event = {
if($radiobutton.checked){write-host "button pressed"}
if($radiobutton1.checked){write-host "button1 pressed"}
$form.Close()
}
 
# create button
$button = New-Object Windows.Forms.Button
$button.Add_Click($event)
$button.text = "OK"
$button.height = 20
$button.width = 50
$button.top = 60
$button.left = 100
$form.controls.add($button)
 
 
# attach controls to form
$form.controls.add($button)
$form.controls.add($label)
$form.controls.add($textbox)
 
[VOID]$form.showdialog()

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