This article explains a problem that happens when a Visual Studio 2005 add-in or macro tries to collapse the nodes of the Solution Explorer.

Cause

This is a bug of Visual Studio 2005.

More Information

Steps to reproduce the problem:

• Create a new VB 2005 project named "WindowsApplication1" (the solution will have the same name).
• Save it and show the solution node in the Solution Explorer.
• Add a new Solution Folder named "NewFolder1".
• Move the WindowsApplication1 project inside the solution folder, so that the hierarchy is "WindowsApplication1" solution, "NewFolder1" solution folder, "WindowsApplication1" project.
• Ensure that all nodes in the solution explorer are expanded.
• Create a Visual Basic 2005 macro as follows which should collapse the node of the project:

Dim colUIHierarchyItems As UIHierarchyItems

colUIHierarchyItems = DTE.ToolWindows.SolutionExplorer.UIHierarchyItems
colUIHierarchyItems = colUIHierarchyItems.Item("WindowsApplication1").UIHierarchyItems
colUIHierarchyItems = colUIHierarchyItems.Item("NewFolder1").UIHierarchyItems
colUIHierarchyItems = colUIHierarchyItems.Item("WindowsApplication1").UIHierarchyItems

colUIHierarchyItems.Expanded = False

If colUIHierarchyItems.Expanded = True Then
   MessageBox.Show("Error")
End If

• When you run the macro, you get the "Error" message.

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