Index: src/sdk/projectmanager.cpp
===================================================================
--- src/sdk/projectmanager.cpp    (revision 4010)
+++ src/sdk/projectmanager.cpp    (working copy)
@@ -166,7 +166,7 @@
     EVT_TREE_ITEM_ACTIVATED(ID_ProjectManager, ProjectManager::OnProjectFileActivated)
     EVT_TREE_ITEM_RIGHT_CLICK(ID_ProjectManager, ProjectManager::OnTreeItemRightClick)
     EVT_COMMAND_RIGHT_CLICK(ID_ProjectManager, ProjectManager::OnRightClick)
-
+    EVT_COMMAND_LEFT_DCLICK(ID_ProjectManager, ProjectManager::OnLeftDClick)
     EVT_MENU_RANGE(idOpenWith[0], idOpenWith[MAX_OPEN_WITH_ITEMS - 1], ProjectManager::OnOpenWith)
     EVT_MENU(idOpenWithInternal, ProjectManager::OnOpenWith)
     EVT_MENU(idNB_TabTop, ProjectManager::OnTabPosition)
@@ -1809,6 +1809,23 @@
     m_pTree->PopupMenu(&menu, pt);
 }
 
+void ProjectManager::OnLeftDClick(wxCommandEvent& event)
+{
+    wxTreeItemId sel = m_pTree->GetSelection();
+    FileTreeData* ftd = (FileTreeData*)m_pTree->GetItemData(sel);
+    if (!ftd)
+        return;
+    if(GetActiveProject()==ftd->GetProject())
+         m_pTree->Toggle(sel);
+    else
+        SetProject(ftd->GetProject(), false);
+}
+
+
 void ProjectManager::OnTreeItemRightClick(wxTreeEvent& event)
 {
     #ifdef USE_OPENFILES_TREE
Index: src/include/projectmanager.h
===================================================================
--- src/include/projectmanager.h    (revision 4010)
+++ src/include/projectmanager.h    (working copy)
@@ -383,6 +383,7 @@
         void OnTreeBeginDrag(wxTreeEvent& event);
         void OnTreeEndDrag(wxTreeEvent& event);
         void OnRightClick(wxCommandEvent& event);
+        void OnLeftDClick(wxCommandEvent& event);
         void OnRenameWorkspace(wxCommandEvent& event);
         void OnSaveWorkspace(wxCommandEvent& event);
         void OnSaveAsWorkspace(wxCommandEvent& event);