DataTrigger.ExistActions not firing for binding value “null?

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I have the following datatrigger, but the exitactions is not firing. The enter actions work find. I have also tried convertering the Binding to a boolean to see if it had something to do with the null, but that didn't help either.

What do I have wrong and why isn't my exitactions firing here? EDIT: Something stange must be going on here because I've also tried taking the storyboard out of the equation and just using Setters -- and NOTHING is happening now... So, in lieu of this, I'll post the entire TextBlock and maybe someone can point out what I'm missing Select a configuration on the right to modify its selected columns ConfigTree is a treeview, and SelectedItem. Details is a class that implements observablecollection and INotifyPropertyChanged.

I have checked with the debugger, this binding is updating properly and is toggling back and forth to my instance value and a null value. Wpf xaml storyboard datatrigger link|improve this question edited Feb 10 at 14:26 asked Feb 9 at 15:53mark112.

Btw, I've confirmed that the binding is indeed updating properly. The binding is changing back and forth to a null value as I'm expecting - but no exitactions :( – mark Feb 9 at 15:54.

Thanks, at least now I know that It's not due to a misunderstanding of using exitactions. Still, the exit action for me doesn't seem to be firing and changing my opacity like I would expect. I've verified that the binding is indeed changing from null to instance using a DebugConverter + breakpoint.

When the null enteraction occurs, my opacity enter action triggers, but when set to an instance the exitaction doesn't. What could cause this? – mark Feb 10 at 13:52.

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