You posted this in the Silverlight forum. Is this a Silverlight issue or a Win Forms one? "WPF has many lovers. It's a veritable porn star!" - Josh Smith As Braveheart once said, "You can take our freedom but you'll never take our Hobnobs!" - Martin Hughes. My blog | My articles | MoXAML PowerToys | Onyx

The Children property of a Grid is a UIElementCollection, which is not Observable, and is sealed. So I have the same question - is there any way to see if the Children collection in a Panel has changed?

As Dave said - Dependency Properties need to be static. As well as Dr WPFs snippets, you may want to download MoXAML and install it in Visual Studio. One of the addin commands allows you to add boilerplate dependency properties just by filling in a dialog box. Follow my sig for the addin. "WPF has many lovers. It's a veritable porn star!" - Josh Smith My blog | My articles | MoXAML PowerToys

Try <VisualBrush TileMode="FlipX" Viewport="0,0,20,20" ViewportUnits="Absolute" Stretch="Uniform"> Mark Salsbery Microsoft MVP - Visual C++ :java:

Without seeing the code, it would be hard to hazard a guess. There is no fundamental reason they shouldn't work, unless you are using internal classes/events here. Deja View - the feeling that you've seen this post before. My blog | My articles | MoXAML PowerToys

That because Explorer only launches your application with one file at a time. Your code is expecting this: MyApp.exe file1.txt file2.txt file3.txt file4.txt Explorer is actually launching this: MyApp.exe file1.txt MyApp.exe file2.txt MyApp.exe file3.txt MyApp.exe file4.txt Google for "Single instance application c#" for examples on how to deal with this situation and pass the filename from one instance of your app to another. A guide to posting questions on CodeProject[^] Dave Kreskowiak Microsoft MVP Visual Developer - Visual Basic      2006, 2007, 2008

You are welcome. Hope you will be able to find interesting results. Giorgi Dalakishvili #region signature my articles My blog[^] #endregion