expression-blend-4

I am part of the development of a larger-scale Silverlight 4 project, where we will have a set of symbols that should be used across different parts of the GUI (see the example below). These icons are made from multiple paths directly in Blend, and will be used, either singly or as different visual states in usercontrols (with the same icon used in more than one context). In order to facilitate changing the design of a single icon, and having it propagate throughout the application, what is the best way to store these? I have tried creating styles from them (right click -> edit style..), but

I had started a question here: WPF drag and drop files onto TreeView from windows explorer but I just discovered this is a totally different problem that what I thought it was. I have an extremely simple test case. I was using a treeview but if I use a simple listbox with no code just the following xaml <StackPanel Orientation="Vertical"> <ListBox Height="312" Background="#FFBDD6FF" AllowDrop="True"/> </StackPanel> If I run the project in expression blend and drag a file over the listbox I see the arrow and the little square below it that incdicates you can drag and drop. If I run the same