diff --git a/src/BlazorDatasheet/Datasheet.razor.cs b/src/BlazorDatasheet/Datasheet.razor.cs
index 815731da..1e898ba2 100644
--- a/src/BlazorDatasheet/Datasheet.razor.cs
+++ b/src/BlazorDatasheet/Datasheet.razor.cs
@@ -220,7 +220,7 @@ private void HandleCellMouseUp(int row, int col, MouseEventArgs e)
     private void HandleCellMouseDown(int row, int col, MouseEventArgs e)
     {
         if (e.ShiftKey && Sheet?.Selection?.ActiveRegion != null)
-            Sheet?.Selection?.ActiveRegion.ExtendTo(row, col);
+            Sheet?.Selection?.ExtendTo(row, col);
         else
         {
             if (!e.MetaKey && !e.CtrlKey)
@@ -242,7 +242,7 @@ private void HandleCellMouseDown(int row, int col, MouseEventArgs e)
     private void HandleColumnHeaderMouseDown(int col, MouseEventArgs e)
     {
         if (e.ShiftKey && Sheet?.Selection?.ActiveRegion != null)
-            Sheet?.Selection?.ActiveRegion.ExtendTo(0, col);
+            Sheet?.Selection?.ExtendTo(0, col);
         else
         {
             if (!e.MetaKey && !e.CtrlKey)
@@ -259,7 +259,7 @@ private void HandleColumnHeaderMouseDown(int col, MouseEventArgs e)
     private void HandleRowHeaderMouseDown(int row, MouseEventArgs e)
     {
         if (e.ShiftKey && Sheet?.Selection?.ActiveRegion != null)
-            Sheet?.Selection?.ActiveRegion.ExtendTo(row, 0);
+            Sheet?.Selection?.ExtendTo(row, 0);
         else
         {
             if (!e.MetaKey && !e.CtrlKey)
diff --git a/src/BlazorDatasheet/Selecting/Selection.cs b/src/BlazorDatasheet/Selecting/Selection.cs
index 6ba192a3..5f1e558e 100644
--- a/src/BlazorDatasheet/Selecting/Selection.cs
+++ b/src/BlazorDatasheet/Selecting/Selection.cs
@@ -218,6 +218,17 @@ public void Remove(IRegion region)
         emitSelectionChange();
     }
 
+    /// <summary>
+    /// Extends the active region to the row/col specified
+    /// </summary>
+    /// <param name="row"></param>
+    /// <param name="col"></param>
+    internal void ExtendTo(int row, int col)
+    {
+        ActiveRegion?.ExtendTo(row, col);
+        emitSelectingChanged();
+    }
+
     /// <summary>
     /// Clears any selections or active selections and sets the selection to the region specified
     /// </summary>