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Karl Shifflett is ready with the next sample in the WPF Sample Applications Series. This sample is the result of the question “how can I do multi-level grouping?” and provides a brief description of the problem, the solution and full source code.

WPF provides the CollectionViewSource for codeless sorting and grouping of data.  The SortDescriptions and GroupDescriptions collections can be modified at runtime if desired.  The SortDescription provides the ability to set the sort direction as I’ve done for the Sales.

Brian Genisio is continuing his series of “Adventures in MVVM” and this time talks about a few different approaches to working with List Boxes with the MVVM pattern.

What I am writing here is generally true of all controls that derive from Selector, including ListBox and ComboBox.  This example was developed in Silverlight, but the same concepts also apply to WPF.

There are many posts which shows how to do the flip animation, here is mine. In the sample the flip animation is applied to the ListBoxItem in the Styles.

Kevin Dockx will show you how to make a Silverlight combobox editable.

Well, it's actually easier than you might think, so for all of you who want this kind of behaviour: here's how you do it! :-)  The same technique can also be used to make an editable listbox, and usual, sourcecode is included at the end of this post.

Earlier this month I blogged about adding the ScrollIntoViewCentered method to WPF's ListBox control. At the time, I explained why it was necessary to set ScrollViewer.CanContentScroll to False for the code I'd written to function. The limitation didn't matter for my scenario, so I didn't spend too much time worrying about it then...

However, after putting the code into use for my RepositoryExplorer version control system browser side-project, I discovered a bug. And further investigation proved that it wasn't a bug in my code - it was a bug in WPF!

• Single - you can select only one item.
• Multiple - you can select multiple items by selecting one item, holding Ctrl or Shift key and pressing another item.
• Extended - you can again select multiple items but the Shift key acts differently. With the help of the Shift key you can select items range by just pressing one item, holding Shift and pressing another one.

David Anson has typed a ScrollIntoViewCentered extension method that you may call to bring one of the items in a WPF ListBox into view.

In my scenario, the user would recognize the item when he/she saw it, so my problem wasn't about setting focus or rendering a highlight; it was just about bringing the item into view so it could be seen and manipulated. I started in the obvious place: the ListBox.ScrollIntoView method. Sure enough, a call to this method scrolled the item into view just like it was supposed to - and yet I wasn't completely satisfied... :)

Andrej Tozon has a quick tip on making the ListBox items behave as disabled.

The data context of this ListBox is a ViewModel with the Lights property. Lights is a collection of five Light objects.

One property that the Light object exposes is the Brush property; it will simply point to a solid color brush of a red, yellow or green color, respectively. The Ellipse’s Fill property is bound to the Brush property as can observed in the above code.