Add a custom DevExpress theme with its goofy theme builder.

Here are the steps I took:

1. I set up a fresh new VMware VM and I put Visual Studio 2013 on it.
    
2. I downloaded DevExpress from here and installed it. This put a DEVEXPRESS menu within Visual Studio.
    
3. I spun up a new DevExpress friendly ASP.NET MVC project (with C#) with:
   DEVEXPRESS > All Platforms > New Project...
    
4. The default app that gets made which ties into that corny Northwind database has a GridView in it in a .cshtml partial which looks like this:
   @Html.DevExpress().GridView(
   settings =>
   {
      settings.Name = "GridView";
      settings.CallbackRouteValues = new { Controller = "Home",
            Action = "GridViewPartialView" };
      settings.Width = System.Web.UI.WebControls.Unit.Percentage(100);
      settings.SettingsPager.PageSize = 32;
      settings.Settings.VerticalScrollBarMode = ScrollBarMode.Visible;
      settings.Settings.VerticalScrollableHeight = 350;
      settings.ControlStyle.Paddings.Padding =
            System.Web.UI.WebControls.Unit.Pixel(0);
      settings.ControlStyle.Border.BorderWidth =
            System.Web.UI.WebControls.Unit.Pixel(0);
      settings.ControlStyle.BorderBottom.BorderWidth =
            System.Web.UI.WebControls.Unit.Pixel(1);
      settings.Columns.Add("ContactName");
      settings.Columns.Add("CompanyName");
      settings.Columns.Add("ContactTitle");
      settings.Columns.Add("City");
      settings.Columns.Add("Phone");
   }).Bind(Model).GetHtml()
    
5. I then opened the theme builder from Visual Studio (even though it is a standalone application independent from Visual Studio and I may open it independently) with:
   DEVEXPRESS > ASP.NET Controls v15.1.3 > Run ASP.NET Theme Builder...
    
6. I tweaked an existing theme into my own (you'll see CSS to edit) and saved it, giving it a name, and then I built an assembly with a different name yet, which got saved out to a .dll, with:
   DEVEXPRESS > All Platforms > New Project...
    
7. Back in Visual Studio, I added a reference to the .dll.
    
8. I founf the DevExpress blob of the Web.config file which looked like this:
   <devExpress>
      <themes enableThemesAssembly="true" styleSheetTheme="" theme="DevEx"
            customThemeAssemblies="" />
      <compression enableHtmlCompression="false"
            enableCallbackCompression="true" enableResourceCompression="true"
            enableResourceMerging="true" />
      <settings doctypeMode="Html5" rightToLeft="false"
            embedRequiredClientLibraries="true" ieCompatibilityVersion="edge" />
      <errors callbackErrorRedirectUrl="" />
   </devExpress>
    
9. The settings for theme and customThemeAssemblies both needed to change. I filled in the two separate names I gave to both my theme and the assembly I rendered out from it to a .dll.
    
10. I ran the application in Cassini and my theme was biasing things as expected.