Change to expand the tree

I18N Commander/UI WinForms/Components/SectionTree.cs

@@ -1,5 +1,4 @@
-using DataModel.Database;
+using DataModel.Database.Common;
-using DataModel.Database.Common;
 using Microsoft.Extensions.DependencyInjection;
 using Processor;
 using UI_WinForms.Dialogs;
@@ -106,6 +105,9 @@ public partial class SectionTree : UserControl
             foreach (var node in missingParents)
                 rootMissedParents.Nodes.Add(node);
         }
+        
+        // Expand the tree:
+        this.treeView.ExpandAll();
     }
 
     private async void buttonAdd_Click(object sender, EventArgs e)