The following macro works perfectly when used in a template:

@inherits umbraco.MacroEngines.DynamicNodeContext

@if (Model.HasValue("Fotos"))
    {
        foreach (var item in Model.GetProperty("Fotos").Value.Split(','))
        {
            <img src="@Model.MediaById(@item).umbracoFile" alt="" />
        }

    }

Only the top part of the following Macro works when used in the RTE field:

@inherits umbraco.MacroEngines.DynamicNodeContext

    @* This give me nice media ID list like 1115,1114,1116 in the rte doc type *@
    @if(Html.Raw(Parameter.ListeAlias) != null)
    {
        <p>1 Test to see if Alias data can be found</p>
        @(Html.Raw(Parameter.ListeAlias))
    }

@if (Model.Content.HasValue("ListeAlias"))
    {
        foreach (var item in Model.GetProperty("ListeAlias").Value.Split(','))
        {
            <p>2 Test to see if Alias data can be found</p>
            @Model.MediaById(@item).umbracoFile
        }

    }

I have tried with:

Model.Content.HasValue("ListeAlias")

and

Model.HasValue("ListeAlias")

I some how need to reference the Alias data from the macro being used in the richtexteditor field.

Thanks