I have built my own components for the following components that I use, but since MS is developing built-in components, I thought I'd put some ideas in the ring.
Header component: I feel that it lacks some features as follows.
1. Back button
2. App Menu (Most of my apps have many screens and therefore need a way to navigate to some screens)
3. Settings Menu (Similarly - I need to give users a way to maintain settings and reference/lookup tables)
4. Help button
Perhaps these objects could/should be in a separate navigation component on its own ?
Need to expose X and Y, colors and other properties for objects in the component. (current options are too restricted)
I have also noticed that the color that is being displayed in the header is not the same when assigned to other objects that are used in the app. (I have tried changing the Style)
Another component that I am waiting for :
Dialogue Pop-Up
This is handy for General Information or Help Screens etc.
Could also be used for things like Printer selection / Composing Emails or data input and would contain :
Each object should expose properties like visible, text to display, Height, Width, Background Color, Radius etc to be edited as required
HEADER BAR
1. Text Label - for Dialogue title
2. Close / Exit icons
BODY
1. Text Label - for Dialogue Information
2. Text Input -
3. Combo box
4. List Box
5. Radio Buttons
6. Check Box
FOOTER
3 x buttons - for interactive options (eg: Yes / No / Cancel).