diff --git a/DevelopAssistant.AddIn.Diffplex/MainForm.cs b/DevelopAssistant.AddIn.Diffplex/MainForm.cs
index 0ec8e930b887b40104fe9578cbd88be22bf6e82a..16ff3b1de603a5cf1c13683765c808107748473d 100644
--- a/DevelopAssistant.AddIn.Diffplex/MainForm.cs
+++ b/DevelopAssistant.AddIn.Diffplex/MainForm.cs
@@ -1,4 +1,4 @@
-using DevelopAssistant.AddIn.Diffplex.Properties;
+using DevelopAssistant.AddIn.Diffplex.Properties;
 using DevelopAssistant.Service;
 using DiffPlex;
 using DiffPlex.DiffBuilder;
@@ -322,7 +322,7 @@ namespace DevelopAssistant.AddIn.Diffplex
 
         private void comboFontName_SelectedIndexChanged(object sender, EventArgs e)
         {
-            var item = ((ComboBox)sender).SelectedItem;
+            var item = ((NComboBox)sender).SelectedItem;
             SourceTextControl.Font = new Font(item + "", 12.0f);
             TargetTextControl.Font = new Font(item + "", 12.0f);
         }