diff --git a/Microsoft.Toolkit.Uwp.UI.Controls.DataGrid/DataGrid/DataGridComboBoxColumn.cs b/Microsoft.Toolkit.Uwp.UI.Controls.DataGrid/DataGrid/DataGridComboBoxColumn.cs
index 42f67a40b51..d70e56d0986 100644
--- a/Microsoft.Toolkit.Uwp.UI.Controls.DataGrid/DataGrid/DataGridComboBoxColumn.cs
+++ b/Microsoft.Toolkit.Uwp.UI.Controls.DataGrid/DataGrid/DataGridComboBoxColumn.cs
@@ -383,7 +383,13 @@ protected override void CancelCellEdit(FrameworkElement editingElement, object u
         /// <returns>The unedited value. </returns>
         protected override object PrepareCellForEdit(FrameworkElement editingElement, RoutedEventArgs editingEventArgs)
         {
-            return (editingElement as ComboBox)?.SelectedItem;
+            if(editingElement is ComboBox comboBox)
+            {
+                comboBox.IsDropDownOpen = true;
+                return comboBox.SelectedItem;
+            }
+
+            return null;
         }
 
         /// <summary>