How to control the color of control background and foreground.

Hello,

If you run our Theme Designer application, you can customize the values in the property grid's Grayscale Palette and other sections to tweak the overall look of a theme.  The linked documentation topic talks about how to then use the adjusted ThemeDefinition in your app startup.

If you are looking to customize individual brushes, you can see them all in the Resource Browser tab in the Theme Designer app.  There is a filter textbox in that tab, so you can enter things like "ButtonForeground" or "ContainerBackground" to see related brushes.  And this documentation topic tells you how you can customize individual brush values if you don't like our generated values.