GetLoadParameter.ps1

function Get-CustomLoadParameter {
    [CmdletBinding()]
    param(
       [Parameter(Mandatory=$true)]
       [Microsoft.SharePoint.Client.ClientObject]$Object,
       [Parameter(Mandatory=$true)]
       [string]$PropertyName
    )

    # Reference: http://sharepoint.stackexchange.com/questions/126221/spo-retrieve-hasuniqueroleassignements-property-using-powershell

    $Context = $Object.Context
    $Load = [Microsoft.SharePoint.Client.ClientContext].GetMethod("Load") 
    $Type = $Object.GetType()
    $ClientLoad = $Load.MakeGenericMethod($Type) 

    $Parameter = [System.Linq.Expressions.Expression]::Parameter(($Type), $Type.Name)
    $Expression = [System.Linq.Expressions.Expression]::Lambda(
        [System.Linq.Expressions.Expression]::Convert(
            [System.Linq.Expressions.Expression]::PropertyOrField($Parameter,$PropertyName),
            [System.Object]
        ),
        $($Parameter)
        )
    $ExpressionArray = [System.Array]::CreateInstance($Expression.GetType(), 1)
    $ExpressionArray.SetValue($Expression, 0)

    return $ExpressionArray
}