WPF element that dynamically creates (encapsulated) children at runtime

I want to create a WPF element that, at runtime, is in full control of its child elements -- adding and removing child UI when its properties change. Something a bit like what ItemsControl does when y

How to make the value of one select box drive the options of a second select box

I want to make an HTML form with 2 select boxes.The selected option in the first select box should drive the options in the second select box.I would like to solve this dynamically on the client (usin

注定歌词常思思？