First create solution

Nuvolar.Module/BusinessObjects/Project/ProjectBar.vb

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+Imports System
+Imports System.ComponentModel
+
+Imports DevExpress.Xpo
+Imports DevExpress.Data.Filtering
+
+Imports DevExpress.ExpressApp
+Imports DevExpress.Persistent.Base
+Imports DevExpress.Persistent.BaseImpl
+Imports DevExpress.Persistent.Validation
+
+<DefaultClassOptions(), NavigationItem(False), CreatableItem(False)> _
+Public Class ProjectBar
+    Inherits BaseObject
+    Private _ProjectRows As ProjectRows
+    Private _DateStart As Date
+    Private _DateEnd As Date
+
+    Public Sub New(ByVal session As Session)
+        MyBase.New(session)
+    End Sub
+    Public Overrides Sub AfterConstruction()
+        MyBase.AfterConstruction()
+    End Sub
+
+    Property ProjectRows As ProjectRows
+        Get
+            Return _ProjectRows
+        End Get
+        Set(value As ProjectRows)
+            SetPropertyValue("ProjectRows", _ProjectRows, value)
+        End Set
+    End Property
+    Property DateStart As Date
+        Get
+            Return _DateStart
+        End Get
+        Set(value As Date)
+            SetPropertyValue("DateStart", _DateStart, value)
+        End Set
+    End Property
+    Property DateEnd As Date
+        Get
+            Return _DateEnd
+        End Get
+        Set(value As Date)
+            SetPropertyValue("DateEnd", _DateEnd, value)
+        End Set
+    End Property
+End Class