How do I get properties in PSScriptPad if I can't click on the element?

So, I’m working on a simple GUI, and having trouble. I added a Border around a StackPanel in the XML pane by simply typing it in.

Problem is, there seems to be no way to access its properties in the “Properties” pane. No search by name, no link from the XML pane, and I’m sorry but I’m not going pixel-hunting in the preview pane to maybe find it or maybe not.

How do I get the properties for a specific element?

Or do I have to have the Microsoft dox website open and just hunt for property names there and type in stuff?