diff --git a/AirBomber/AirBomber/AirplaneCompareByType.cs b/AirBomber/AirBomber/AirplaneCompareByType.cs
index 464b8f6..43bc7ce 100644
--- a/AirBomber/AirBomber/AirplaneCompareByType.cs
+++ b/AirBomber/AirBomber/AirplaneCompareByType.cs
@@ -18,9 +18,9 @@
             {
                 return -1;
             }
-            if (xAirplane.GetType().Name != yAirplane.Airplane.GetType().Name)
+            if (xAirplane.Airplane.GetType().Name != yAirplane.Airplane.GetType().Name)
             {
-                if (xAirplane.Airplane.GetType().Name == "DrawningAirplane")
+                if (xAirplane.Airplane.GetType() == typeof(DrawningAirplane))
                 {
                     return -1;
                 }
diff --git a/AirBomber/AirBomber/FormMapWithSetAirplanes.Designer.cs b/AirBomber/AirBomber/FormMapWithSetAirplanes.Designer.cs
index b7aa21f..9c855b6 100644
--- a/AirBomber/AirBomber/FormMapWithSetAirplanes.Designer.cs
+++ b/AirBomber/AirBomber/FormMapWithSetAirplanes.Designer.cs
@@ -298,7 +298,7 @@
             this.buttonSortByColor.TabIndex = 11;
             this.buttonSortByColor.Text = "Отсортировать по цвету";
             this.buttonSortByColor.UseVisualStyleBackColor = true;
-            this.buttonSortByColor.Click += new System.EventHandler(this.ButtonSortByType_Click);
+            this.buttonSortByColor.Click += new System.EventHandler(this.ButtonSortByColor_Click);
             // 
             // buttonSortByType
             // 
@@ -308,7 +308,7 @@
             this.buttonSortByType.TabIndex = 12;
             this.buttonSortByType.Text = "Отсортировать по типу";
             this.buttonSortByType.UseVisualStyleBackColor = true;
-            this.buttonSortByType.Click += new System.EventHandler(this.ButtonSortByColor_Click);
+            this.buttonSortByType.Click += new System.EventHandler(this.ButtonSortByType_Click);
             // 
             // FormMapWithSetAirplanes
             // 
diff --git a/AirBomber/AirBomber/MapWithSetAirplanesGeneric.cs b/AirBomber/AirBomber/MapWithSetAirplanesGeneric.cs
index cd48a0b..96b94fb 100644
--- a/AirBomber/AirBomber/MapWithSetAirplanesGeneric.cs
+++ b/AirBomber/AirBomber/MapWithSetAirplanesGeneric.cs
@@ -7,7 +7,7 @@ using System.Threading.Tasks;
 namespace AirBomber
 {
     internal class MapWithSetAirplanesGeneric<T, U>
-        where T : class, IDrawningObject
+        where T : class, IEquatable<T>, IDrawningObject
         where U : AbstractMap
     {
         /// <summary>