WPF test higlighted

Question

Hi,

I have a treeview that look like this:

1. Header a) sub header 1 b) sub header 2

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The header will play both a) and b) video. So when I click the header, The default background colour of the treeview is blue while the foreground is white colour.

When it is playing on a) I want that default background blue to be automatically highlighted at a) sub header 1 and after 5 second when it is playing on b) sub header 2 i want it to highlighted on b) instead on a), how should i write the code?

Thx a lots!