how to replace this with modal dialog:
<div id="selectvehicles" style="display:none;">
        @using (Html.BeginForm("SelectVehicles", "DynRequestForRouting", FormMethod.Post, new { id = "selectVehiclesForm" }))
        {
            @Html.Partial("_SelectVehicles", @Model)
        }
    </div>
    @Html.Partial("EditDynODLVehicles", @Model)
</div>