diff --git a/src/AdvancedCalculator/Views/MainView.axaml b/src/AdvancedCalculator/Views/MainView.axaml
index dba5f04..927f01a 100644
--- a/src/AdvancedCalculator/Views/MainView.axaml
+++ b/src/AdvancedCalculator/Views/MainView.axaml
@@ -37,7 +37,6 @@
             <ListBox.ItemTemplate>
               <DataTemplate>
                 <Button Background="Transparent" BorderThickness="0" Padding="8" MinHeight="44"
-                        x:DataType="{x:Null}"
                         AutomationProperties.Name="Insert variable"
                         Tag="{Binding}"
                         DataContext="{Binding $parent[UserControl].DataContext}"
@@ -72,7 +71,6 @@
             <ListBox.ItemTemplate>
               <DataTemplate>
                 <Button Background="Transparent" BorderThickness="0" Padding="8" MinHeight="44"
-                        x:DataType="{x:Null}"
                         AutomationProperties.Name="Insert function"
                         Tag="{Binding}"
                         DataContext="{Binding $parent[UserControl].DataContext}"