Hi,
Your code is actually correct and it “should” work but unfortunately it doesn’t in the current build due to a bug. We will fix it as soon as possible. The alternative is to place a CustomItem directly in the page and then set your TabItem’s CustomItemID to the ID of your custom item (I believe we have mentioned this to you before). You can find a working example about how to use this feature here:
http://demo.essentialobjects.com/Demos/Menu/Features/Nesting%20Controls/Demo.aspxAs to the samples, we appreciate your feedback but we do have over 200 samples and we believe they are sufficient. The key is the samples are for you to understand how our product works. They are
not for you to just copy and paste without knowing why. There are literally millions of developers out there each with a different scenario. It is not possible for us to have a sample for each of them. As a result, it is often necessary for you to understand the sample and then adapt it to fit your exact scenario. In this case, the way CustomItem works are exactly the same for Menu and TabStrip (because they both derives from BaseNavigator). So you can base your code on that sample.
Thanks