The problem isn't that the EventArgs object is null; it's that the EventArgs object isn't being passed as the command parameter to your RelayCommand. If you're using the Microsoft.Xaml.Behaviors.Wpf[^] package, you need to set PassEventArgsToCommand="True" on your <i:InvokeCommandAction> element. If you're using Prism, that will pass the event args automatically if the command parameter is not set. But that would use a different namepsace prefix on the InvokeCommandAction element. 6: Advanced MVVM Scenarios Using the Prism Library 5.0 for WPF | Microsoft Docs[^] Other platforms will have different approaches. There are quite a few documented on this SO thread: wpf - MVVM Passing EventArgs As Command Parameter - Stack Overflow[^] "These people looked deep within my soul and assigned me a number based on the order in which I joined." - Homer

The problem is that you're setting the Path of the binding. The FocusedElement property relies on the ElementName of the binding: FocusManager.FocusedElement Attached Property (System.Windows.Input) | Microsoft Docs[^]: FocusManager.FocusedElement="{Binding ElementName=firstButton}" You can't bind the properties of a binding, so you can't do this: {Binding ElementName={Binding ...}} Short of using the code-behind for the view, the simplest option is probably to use a style with a series of data triggers, as shown in this SO answer[^]: <Style> <Style.Triggers> <DataTrigger Binding="{Binding FocusedElement}" Value="First"> <Setter Property="FocusManager.FocusedElement" Value="{Binding ElementName=txtbox1}"/> </DataTrigger> </Style.Triggers> </Style> "These people looked deep within my soul and assigned me a number based on the order in which I joined." - Homer

Unfortunately you have posted this message on a page dedicated to issues with the site itself. You will have more luck if you post this in the QA page with more details. Advanced TypeScript Programming Projects

private void button_Click(object sender, RoutedEventArgs e) { string s = textblock.Text + " " + textbox.Text; Clipboard.SetText( s ); } (I'd pick better "names" for my controls). It was only in wine that he laid down no limit for himself, but he did not allow himself to be confused by it. ― Confucian Analects: Rules of Confucius about his food

Thanks for the reply. Setting UpdateSourceTrigger to LostFocus dit it BTW, here's an interesting solution: [c# - How do I get a TextBox to only accept numeric input in WPF? - Stack Overflow](https://stackoverflow.com/questions/1268552/how-do-i-get-a-textbox-to-only-accept-numeric-input-in-wpf) If it's not broken, fix it until it is. Everything makes sense in someone's mind. Ya can't fix stupid.

For a moment I thought he'd died and had a small heart attack. I'm just glad he's moved on from XML. cheers Chris Maunder

Yup. I'm an idiot. I spent hours trying to figure out why I'm not seeing anyting. Thanks! If it's not broken, fix it until it is. Everything makes sense in someone's mind. Ya can't fix stupid.

How old are you? 100??

Did you first try de-serializing it on the same machine where it was serialized? The difficult we do right away... ...the impossible takes slightly longer.

A SOAP message is a plain XML document that contains the following elements: An Envelope element that identifies the XML document as a SOAP message. by pro custom writers

. Robust Services Core | Software Techniques for Lemmings | Articles The fox knows many things, but the hedgehog knows one big thing.

Excellent! I see you recognized "this" (the data source) as the form. It was only in wine that he laid down no limit for himself, but he did not allow himself to be confused by it. ― Confucian Analects: Rules of Confucius about his food

That makes sense. It was only in wine that he laid down no limit for himself, but he did not allow himself to be confused by it. ― Confucian Analects: Rules of Confucius about his food

Creating "empty" interfaces seem questionable to start with. public interface IHazardLocation {} It was only in wine that he laid down no limit for himself, but he did not allow himself to be confused by it. ― Confucian Analects: Rules of Confucius about his food

$1 billion / year translates to $30 / second. Given that Bezos has ~$185 billion, and that his life expectancy is certainly under 50 years, he could spend ~$100 / second, and still leave a few billion to his heirs. I doubt we'll ever see him living under a bridge... :laugh: EDIT: s/Besos/Bezos/ Freedom is the freedom to say that two plus two make four. If that is granted, all else follows. -- 6079 Smith W.

:-D "I have no idea what I did, but I'm taking full credit for it." - ThisOldTony "Common sense is so rare these days, it should be classified as a super power" - Random T-shirt AntiTwitter: @DalekDave is now a follower!