I expect to see more from a UI library, instead of a bunch of "would be cool to add" modules. When you use a UI library in your project you somehow get married to it. For everything that UI library doesn't provide you have to use other libraries, then it becomes a mess.

For this reason I refuse to use a non-complete library (where as lots of UI elements are missing such as this one). If I'll have to fill the missing parts with other frameworks I won't use it at the very beginning.