diff --git a/AbazovApp/AbazovAppView/FormTest.cs b/AbazovApp/AbazovAppView/FormTest.cs
index dbf6589..8362f57 100644
--- a/AbazovApp/AbazovAppView/FormTest.cs
+++ b/AbazovApp/AbazovAppView/FormTest.cs
@@ -79,7 +79,7 @@ namespace AbazovAppView
         {
             try
             {
-                DateTime date = abazovDatePicker.Value;
+                DateTime? date = abazovDatePicker.Value;
                 MessageBox.Show(date.ToString(), "Через свойство");
             }
             catch (DateBoundsNotSetException ex)
diff --git a/AbazovApp/AbazovViewComponents/Components/AbazovCheckedListBox.cs b/AbazovApp/AbazovViewComponents/Components/AbazovCheckedListBox.cs
index f9c9a17..0b5e086 100644
--- a/AbazovApp/AbazovViewComponents/Components/AbazovCheckedListBox.cs
+++ b/AbazovApp/AbazovViewComponents/Components/AbazovCheckedListBox.cs
@@ -25,7 +25,7 @@ namespace AbazovViewComponents.Components
             }
             set
             {
-                checkedListBox.SelectedItem = value;
+                if (value != null && checkedListBox.Items.Contains(value)) checkedListBox.SelectedItem = value;
             }
         }
 
@@ -46,7 +46,7 @@ namespace AbazovViewComponents.Components
 
         private void checkedListBox_SelectedIndexChanged(object sender, EventArgs e)
         {
-            SelectedItemChange.Invoke(checkedListBox.SelectedItem.ToString());
+            SelectedItemChange?.Invoke(checkedListBox.SelectedItem.ToString());
         }
     }
 }
diff --git a/AbazovApp/AbazovViewComponents/Components/AbazovDatePicker.cs b/AbazovApp/AbazovViewComponents/Components/AbazovDatePicker.cs
index de38c4f..224538d 100644
--- a/AbazovApp/AbazovViewComponents/Components/AbazovDatePicker.cs
+++ b/AbazovApp/AbazovViewComponents/Components/AbazovDatePicker.cs
@@ -21,6 +21,8 @@ namespace AbazovViewComponents.Components
         private bool lowBoundrySet = false;
         private bool highBoundrySet = false;
 
+        public bool BoundriesSet { get { return lowBoundrySet && highBoundrySet; } }
+
         public DateTime? dateFrom
         {
             get
@@ -51,23 +53,22 @@ namespace AbazovViewComponents.Components
             }
         }
 
-        public DateTime Value
+        public DateTime? Value
         {
             get 
-            { 
-                if (dateFrom is null && dateTo is null) throw new DateBoundsNotSetException("Не заданы диапазоны компонента!");
-                if (this.dateTimePicker.Value < dateFrom || this.dateTimePicker.Value > dateTo) throw new DateOutOfBoundsException("Дата вне диапазона!");
-                return this.dateTimePicker.Value; 
+            {
+                if (!lowBoundrySet || !highBoundrySet || dateTimePicker.Value < dateFrom || dateTimePicker.Value > dateTo) return null;
+                return dateTimePicker.Value;
             }
             set 
             { 
-                if (dateFrom is not null && dateTo is not null && value >= dateFrom && value <= dateTo) this.dateTimePicker.Value = value; 
+                if (lowBoundrySet && highBoundrySet && value.HasValue && value.Value >= dateFrom && value.Value <= dateTo) dateTimePicker.Value = value.Value; 
             }
         }
 
         private void dateTimePicker_ValueChanged(object sender, EventArgs e)
         {
-            DateChange.Invoke(dateTimePicker.Value);
+            DateChange?.Invoke(dateTimePicker.Value);
         }
     }
 }
diff --git a/AbazovApp/AbazovViewComponents/Components/AbazovTreeView.cs b/AbazovApp/AbazovViewComponents/Components/AbazovTreeView.cs
index 5511527..8a68255 100644
--- a/AbazovApp/AbazovViewComponents/Components/AbazovTreeView.cs
+++ b/AbazovApp/AbazovViewComponents/Components/AbazovTreeView.cs
@@ -35,39 +35,24 @@ namespace AbazovViewComponents.Components
         {
             if (treeView.SelectedNode == null || treeView.SelectedNode.Nodes.Count > 0) return default(T);
 
-            List<object> values = new List<object>();
-            List<string> fieldNames = new List<string>();
-
             TreeNode? node = treeView.SelectedNode;
 
             var type = typeof(T);
             var fields = type.GetFields();
-            List<Type> types = new List<Type>();
+
+            var item = Activator.CreateInstance(type);
 
             while (node != null)
             {
                 var field = fields.FirstOrDefault(x => x.Name == node.Name);
                 if (field != null)
                 {
-                    Type typeOfField = field.FieldType;
-                    types.Add(typeOfField);
-                    values.Add(Convert.ChangeType(node.Text, typeOfField));
-                    fieldNames.Add(field.Name);
+                    field.SetValue(item, node.Text);
                 }
                 node = node.Parent;
             }
 
-            var constructor = type.GetConstructor(types.ToArray());
-            if (constructor == null) return default(T);
-            var parameters = constructor.GetParameters();
-
-            List<object> valuesForInvoking = new List<object>();
-            foreach (var param in parameters)
-            {
-                int index = fieldNames.IndexOf(param.Name);
-                valuesForInvoking.Add(values[index]);
-            }
-            return (T) constructor.Invoke(valuesForInvoking.ToArray());
+            return item != null ? (T) item : default(T);
         }
 
         public void setHierarchy(List<(string, bool)> fields)