Powershell help, Populate ComboBox with ApplicationPool selection

#Imports cmdlets from ServerManager, IIS Web administration, and IIS Administration
Import-Module WebAdministration
Import-Module IISAdministration
Import-Module ServerManager

Add-Type -AssemblyName System.Windows.Forms
[System.Windows.Forms.Application]::EnableVisualStyles()

$WebsiteCreator                  = New-Object system.Windows.Forms.Form$WebsiteCreator.ClientSize       = '453,456'$WebsiteCreator.text             = "Website Creator"$WebsiteCreator.TopMost          = $false$Label1                          = New-Object system.Windows.Forms.Label$Label1.text                     = "Enter Website Name:"$Label1.AutoSize                 = $true$Label1.width                    = 25$Label1.height                   = 10$Label1.location                 = New-Object System.Drawing.Point(40,33)$Label1.Font                     = 'Microsoft Sans Serif,10'$SiteName                        = New-Object system.Windows.Forms.TextBox$SiteName.multiline              = $false$SiteName.text                   = ".sd.gov"$SiteName.width                  = 152$SiteName.height                 = 20$SiteName.location               = New-Object System.Drawing.Point(40,55)$SiteName.Font                   = 'Microsoft Sans Serif,10'$Label2                          = New-Object system.Windows.Forms.Label$Label2.text                     = "Port:"$Label2.AutoSize                 = $true$Label2.width                    = 25$Label2.height                   = 10$Label2.location                 = New-Object System.Drawing.Point(259,33)$Label2.Font                     = 'Microsoft Sans Serif,10'$PortNumber                      = New-Object system.Windows.Forms.TextBox$PortNumber.multiline            = $false$PortNumber.text                 = "80"$PortNumber.width                = 100$PortNumber.height               = 20$PortNumber.location             = New-Object System.Drawing.Point(259,55)$PortNumber.Font                 = 'Microsoft Sans Serif,10'$Binding                         = New-Object system.Windows.Forms.Label$Binding.text                    = "Enter the Binding:"$Binding.AutoSize                = $true$Binding.width                   = 25$Binding.height                  = 10$Binding.location                = New-Object System.Drawing.Point(40,104)$Binding.Font                    = 'Microsoft Sans Serif,10'$Header                          = New-Object system.Windows.Forms.TextBox$Header.multiline                = $false$Header.text                     = ".sd.gov"$Header.width                    = 150$Header.height                   = 20$Header.location                 = New-Object System.Drawing.Point(40,133)$Header.Font                     = 'Microsoft Sans Serif,10'$Label3                          = New-Object system.Windows.Forms.Label$Label3.text                     = "Physical Path:"$Label3.AutoSize                 = $true$Label3.width                    = 25$Label3.height                   = 10$Label3.location                 = New-Object System.Drawing.Point(40,197)$Label3.Font                     = 'Microsoft Sans Serif,10'$BrowseBtn                       = New-Object system.Windows.Forms.Button$BrowseBtn.text                  = "Browse"$BrowseBtn.width                 = 60$BrowseBtn.height                = 30$BrowseBtn.location              = New-Object System.Drawing.Point(40,254)$BrowseBtn.Font                  = 'Microsoft Sans Serif,10'$TextBox1                        = New-Object system.Windows.Forms.TextBox$TextBox1.multiline              = $false$TextBox1.text                   = "\\state.sd.local\"$TextBox1.width                  = 186$TextBox1.height                 = 20$TextBox1.location               = New-Object System.Drawing.Point(40,224)$TextBox1.Font                   = 'Microsoft Sans Serif,10'$CancelBtn                       = New-Object system.Windows.Forms.Button$CancelBtn.text                  = "Close"$CancelBtn.width                 = 60$CancelBtn.height                = 30$CancelBtn.location              = New-Object System.Drawing.Point(307,374)$CancelBtn.Font                  = 'Microsoft Sans Serif,10'$CreateBtn                       = New-Object system.Windows.Forms.Button$CreateBtn.text                  = "Create"$CreateBtn.width                 = 60$CreateBtn.height                = 30$CreateBtn.location              = New-Object System.Drawing.Point(65,374)$CreateBtn.Font                  = 'Microsoft Sans Serif,10'$Label4                          = New-Object system.Windows.Forms.Label$Label4.text                     = "Choose Application Pool:"$Label4.AutoSize                 = $true$Label4.width                    = 25$Label4.height                   = 10$Label4.location                 = New-Object System.Drawing.Point(259,104)$Label4.Font                     = 'Microsoft Sans Serif,10'$AppPoolBox                      = New-Object system.Windows.Forms.ComboBox$AppPoolBox.text                 = "Application Pool"$AppPoolBox.width                = 151$AppPoolBox.height               = 20$AppPoolBox.location             = New-Object System.Drawing.Point(259,133)$AppPoolBox.Font                 = 'Microsoft Sans Serif,10'$WebsiteCreator.controls.AddRange(@($Label1,$SiteName,$Label2,$PortNumber,$Binding,$Header,$Label3,$BrowseBtn,$TextBox1,$CancelBtn,$CreateBtn,$Label4,$AppPoolBox))

[void]$WebsiteCreator.ShowDialog()

I'm so stuck right now.

I'm trying to make my comboBox populate with a current list of application pools that are on the Webserver, but I don't know how...

Could anyone assist?

I'm sorry, I know the script I posted is long, but there it is, the GUI is built, this is the only piece of the puzzle I'm stuck on.

(GUI code written by Poshgui)