Patch/Cmdlets/Misc/ArgumentCompleter.ps1

$InstanceNameArgumentCompleter = {
    param($commandName, $parameterName, $wordToComplete, $commandAst, $fakeBoundParameters)
    Import-NavModule -Admin
    Get-NAVServerInstance | % { $_.ServerInstance -replace ".*\$", "" } | `
        Where-Object { $_ -like "$wordToComplete*" }
}