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Having such Style
<Style TargetType='TreeViewItem'> <Style.Triggers> <Trigger Property='IsExpanded' Value='True'> <Setter Property='Header' Value='Pink'></Setter> </Trigger> </Style.Triggers> </Style> I would expect the text of the expanded TreeViewItems to be ‘Pink’, but nothing set actually. If I change to Property=’Background’ instead, it works. How Header differs from Background?
I think I’ll need more info to answer this more completely. However, if I have to guess, I’d say you’re probably setting the Header property on the TreeViewItem explicitly like this:
And, in this case, setting it explicitly will override anything that you put in the style.