Visual Studio macro, collapse all items in Solution Explorer

Source: http://blogs.thesitedoctor.co.uk/tim/2010/02/27/Collapse+All+Solution+Explorer+Items+In+Visual+Studio+2010.aspx

Imports System
Imports EnvDTE
Imports EnvDTE80
Imports EnvDTE90
Imports System.Diagnostics
'-----------------------------------------------------------
' CollapseAll Module
'-----------------------------------------------------------
' Simple macro that fully collapses all items in the
' Solution Explorer rather than just the top level node
'
' To make live easier, bind it to a keyboard setting such
' as Ctrl+Shift+` which by default has no bindings (Ctrl+` is
' now used by Resharper
'
' Tested and works with:
' Visual Studio 2005
' Visual Studio 2008
' Visual Studio 2010
'
' Originally from: http://bit.ly/bmRu3W
'-----------------------------------------------------------
Public Module CollapseAll

Sub CollapseTree()
' Get the the Solution Explorer tree
       Dim solutionExplorer As UIHierarchy
       solutionExplorer = DTE.Windows.Item(Constants.vsext_wk_SProjectWindow).Object()

' Check if there is any open solution
       If (solutionExplorer.UIHierarchyItems.Count = 0) Then
Return
End If

' Get the top node (the name of the solution)
       Dim rootNode As UIHierarchyItem = solutionExplorer.UIHierarchyItems.Item(1)
       rootNode.DTE.SuppressUI = True

' Collapse each project node
       Collapse(rootNode, solutionExplorer)

' Select the solution node, or else when you click
       ' on the solution window
       ' scrollbar, it will synchronize the open document
       ' with the tree and pop
       ' out the corresponding node which is probably not what you want.
       rootNode.Select(vsUISelectionType.vsUISelectionTypeSelect)
       rootNode.DTE.SuppressUI = False
End Sub

Private Sub Collapse(ByVal item As UIHierarchyItem, ByRef solutionExplorer As UIHierarchy)
For Each innerItem As UIHierarchyItem In item.UIHierarchyItems
If innerItem.UIHierarchyItems.Count > 0 Then
' Re-cursive call
               Collapse(innerItem, solutionExplorer)
' Collapse
               If innerItem.UIHierarchyItems.Expanded Then
                   innerItem.UIHierarchyItems.Expanded = False
If innerItem.UIHierarchyItems.Expanded = True Then
' Bug in VS 2005
                       innerItem.Select(vsUISelectionType.vsUISelectionTypeSelect)
                       solutionExplorer.DoDefaultAction()
End If
End If

End If
Next
End Sub
End Module