[news.eclipse.platform] Virtual Tree and Lazy Tree Content Provider

["Shawn L. Pecze" <pecze@xxxxxxxxxxxxxxxxxx>]

I saw an earlier post asking a similar question, but I didn't see a good 
answer for this.

I have a tree viewer that I've defined as Virtual.

The content provider implements ILazyTreeContentProvider.  When the tree is 
displayed, the top level elements are displayed properly, however, there 
aren't any plus signs next to them to view any children.

What is the recommended way to get the plus sign to display by default. 
I've tried calling updateChildCount from updateElement, but that results in 
updateElement getting called for the children, which negates the benefit of 
using the virtual tree with lazy loading.