diff --git a/AIStudio.Wpf.DiagramDesigner/Controls/DragThumb.cs b/AIStudio.Wpf.DiagramDesigner/Controls/DragThumb.cs
index e896120..f78fdda 100644
--- a/AIStudio.Wpf.DiagramDesigner/Controls/DragThumb.cs
+++ b/AIStudio.Wpf.DiagramDesigner/Controls/DragThumb.cs
@@ -94,12 +94,14 @@ namespace AIStudio.Wpf.DiagramDesigner.Controls
                     item.SetCellAlignment();
                 }
 
+                Interlocked.Decrement(ref DiagramViewModel.DoCommandManager.BeginDo);
+
                 var blocks = designerItems.OfType<BlockDesignerItemViewModel>().ToList();
                 if (blocks.Any())
                 {
                     (DiagramViewModel as IBlockDiagramViewModel)?.FinishNearBlock(blocks);
                 }
- 
+
                 Dictionary<DesignerItemViewModelBase, Tuple<PointBase, PointBase>> infos =
                 designerItems.OfType<DesignerItemViewModelBase>().ToDictionary(p => p,
                 p => new Tuple<PointBase, PointBase>(p.GetOldValue<PointBase>(nameof(p.TopLeft)), p.TopLeft));
@@ -113,7 +115,6 @@ namespace AIStudio.Wpf.DiagramDesigner.Controls
                       new Tuple<PointBase?, PointBase?>(p.SourceConnectorInfoPart?.Position,
                                                         p.SinkConnectorInfoPart?.Position)));
 
-                Interlocked.Decrement(ref DiagramViewModel.DoCommandManager.BeginDo);
                 DiagramViewModel.DoCommandManager.DoNewCommand(this.ToString(),
                   () => {
                       foreach (var info in infos)
diff --git a/AIStudio.Wpf.DiagramDesigner/ViewModels/BlockViewModel/BlockDesignerItemViewModel.cs b/AIStudio.Wpf.DiagramDesigner/ViewModels/BlockViewModel/BlockDesignerItemViewModel.cs
index 2199bae..427ec5a 100644
--- a/AIStudio.Wpf.DiagramDesigner/ViewModels/BlockViewModel/BlockDesignerItemViewModel.cs
+++ b/AIStudio.Wpf.DiagramDesigner/ViewModels/BlockViewModel/BlockDesignerItemViewModel.cs
@@ -76,7 +76,6 @@ namespace AIStudio.Wpf.DiagramDesigner
                 {
                     next.AlignNext(next.Next);
                 }
-                return;
             }
         }