+4  A: 

It may be WPF inferring a certain amount of transparency because the items don't fall on exact pixel boundaries. Try playing with the SnapsToDevicePixels property on the item containers and see if that helps.

HTH, Kent

Kent Boogaart  2009-08-05 09:38:19
Thanks that was it, I posted the code using SnapsToDevicePixels above.
Edward Tanguay  2009-08-05 09:46:38

related questions

Can someone point me to some guides for WPF
WPF Listbox style with a button
So what am I missing with this here WPF?
When is NavigationService initialized?
WPF Anti aliasing workaround
WPF Image UriSource and Data Binding
How to stop an animation in C# / WPF?
Rich GUI OS X Frameworks?
What is the correct way to create a single instance application?
Enabling a button in WPF depending on ListBox.SelectedIndex
How to apply multiple styles in WPF
How to get list of installed BitmapEncoders/Decoders (the WPF world)?
Preventing Memory Leaks with Attached Behaviours
Variable Bindings in WPF
How to host a WPF form in a MFC application
WPF - Sorting a composite collection
WPF: How to style or disable the default ContextMenu of a TextBox
What WPF books would you recommend?
I don't grok the WPF command pattern
Instrumenting a UI
What real world WPF applications are out there?
What is the value-binding syntax in xaml?
WPF Databinding
Numeric Data Entry in WPF
Hiding inherited members in C#