install my packages fix (#14571)

- fixed a bug where my package would not initiate an install
- attached RequestDownload handler

src/DynamoCoreWpf/ViewModels/PackageManager/PackageManagerSearchViewModel.cs

@@ -647,12 +647,26 @@ private void PopulateMyPackages()
             var pkgs = PackageManagerClientViewModel.CachedPackageList.Where(x => x.Maintainers != null && x.Maintainers.Contains(name)).ToList();
             foreach(var pkg in pkgs)
             {
-                myPackages.Add(new PackageManagerSearchElementViewModel(pkg, false));
+                var p = new PackageManagerSearchElementViewModel(pkg, false);
+                p.RequestDownload += this.PackageOnExecuted;
+
+                myPackages.Add(p);
             }
 
             SearchMyResults = new ObservableCollection<PackageManagerSearchElementViewModel>(myPackages);
         }
 
+        private void ClearMySearchResults()
+        {
+            if (this.SearchMyResults == null) return;
+            foreach (var ele in this.SearchMyResults)
+            {
+                ele.RequestDownload -= PackageOnExecuted;
+            }
+
+            this.SearchMyResults = null;
+        }
+
         /// <summary>
         /// Sort the default package results in the view based on the sorting key and sorting direction.
         /// </summary>
@@ -1116,7 +1130,6 @@ internal void ClearSearchResults()
             {
                 ele.RequestDownload -= PackageOnExecuted;
             }
-
             this.SearchResults.Clear();
         }
 
@@ -1570,6 +1583,8 @@ internal void Close()
             InitialResultsLoaded = false;   // reset the loading screen settings
             RequestShowFileDialog -= OnRequestShowFileDialog;
             nonHostFilter.ForEach(f => f.PropertyChanged -= filter_PropertyChanged);
+
+            ClearMySearchResults();
         }
     }
 }