MSDN says "Gets or sets an arbitrary object value that can be used to store custom information about this element." which means I can store anything I want in this property.
But if you bind to this property (with property of type String having a value say "XYZ") and use it in Trigger conditions it doesn't work!
<Trigger Property="Tag" Value="XYZ">
<Setter Property="Background" Value="Red" />
</Trigger>
It does not set the background red. You can try and assume myElement to be a TextBlock! Why is it like this?