I added three custom buttons to my RadEditor.

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Added the following to my xml file:

<tools name="CustomToolbar" dockable="true" enabled="true">

    <tool name="DatabaseSave" />

    <tool name="Open-Print" />

    <tool name="Email" />

</tools>

Added the following to my markup:
<style type="text/css">

    .reTool .DatabaseSave

    { 

        background-image: url(save.gif);

    }

    .reTool .Open-Print 

    {

        background-image: url(printer.ico);

    }

    .reTool .Email

    { 

        background-image: url(email.gif);

    }

</style>

<telerik:RadEditor ID="RadEditor1" Runat="server" 

ToolsFile="~/Letters/DocMaster/ToolsFile.xml" EditModes="Design" AutoResizeHeight="True" 

ClientIDMode="Inherit" Skin="Hay" Width="100%" />

<script type="text/javascript">

    Telerik.Web.UI.Editor.CommandList["Save"] = function (commandName, editor, args) {

        alert("Pressed Save");

    };

    Telerik.Web.UI.Editor.CommandList["Open-Print"] = function (commandName, editor, args) {

        alert("Pressed Open-Print");

    };

    Telerik.Web.UI.Editor.CommandList["Email"] = function (commandName, editor, args) {

        alert("Pressed Email");

    };

</script>

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The buttons showed with their default glippy no problem. The button press function calls came up no problem. I played with everything I could think of to get the background-image little graphics to show on the buttons using every path methodology I knew or could think of, including internal and external CSS. In my test project, I finally got them to show only by putting the graphics in the same folder as the page that holds the RadEditor. So I incorporated it into the real project. In the real project, the RadEditor is on a nested master page. Nothing I can do nohow will get those buttons to show, no matter where I put them or how I write those paths. Please help.

Thanks.