Accessing an Access Form Control from PowerShell

I have been trying to convert an old VBScript to PowerShell. I have successfully converted all but one innocent-looking sub. In the sub, I need to access a textbox on an Access form, but for the life of me, I cannot figure out how get to the individual form (let alone a control on the form). This is the VBScript that I am trying to convert:

Sub checkLinkStatus(fileToLink)

                Dim oAccess

                Dim oLinkForm

                Set oAccess = GetObject(fileToLink).application

                oAccess.DoCmd.OpenForm "CFG_CFGLink"

                set oLinkForm = oAccess.Forms("CFG_CFGLink")

                oLinkForm.Controls("MasterLocation").value = "Production"

                'These Subs need to be set to PUBLIC before this can be run.

                oLinkForm.Form.MasterLocation_AfterUpdate

                oLinkForm.Form.CmdLink_Click

                oAccess.quit

                Set oAccess = Nothing

End sub

My PowerShell script works okay up to :

      functionlinkDB($dbToLink) {

    $AccessApp=New-Object-ComObjectAccess.Application

    $AccessApp.OpenCurrentDatabase($dbToLink,10)

    $AccessApp.DoCmd.OpenForm("CcaCFGLink" )

To access the form, I have unsuccessfully tried many different lines including :

$LinkForm=Get-Item$AccessApp.Forms("CcaCFGLink")

$LinkForm=Get-Item$AccessApp.Forms(0)

$LinkForm=Get-Item$AccessApp.Forms.Item("CcaCFGLink")

$LinkForm=Get-Item$AccessApp.Forms.Item(0)

I have also tried looping through the form collection using a foreach, but to no avail. Of course I am trying to ultimately access a control on the form, but I cannot even access the form! How do I access the form and the control on the form. Any advice would be appreciated. I have looked high and low on the Internet without finding any solutions. Thanks.

Darren White