Custom ArgumentCompleter attribute

test.ps1

Param(
        [Parameter(Mandatory)]
        [ArgumentCompleter(
            {
                param($commandName, $parameterName, $wordToComplete, $commandAst, $fakeBoundParameter)
                $allTimezones = Get-TimeZone -ListAvailable | Group-Object DisplayName -AsHashTable -AsString
                $allTimezones.GetEnumerator() | Where-Object { $_.Name -like "*${wordToComplete}*" } |
                Sort-Object { $_.Value.Displayname }-Unique | ForEach-Object {
                    New-Object System.Management.Automation.CompletionResult (
                        "'$($_.Value.Id)'",
                        $_.Value.DisplayName,
                        'ParameterValue',
                        $_.Value.DisplayName
                    )
                }
            }
        )]
        [Alias('tz')]
        $RemoteTimeZone
    )