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    copied!<p>Of course im using it on two different positions here is the smallest:</p> <pre><code>&lt;UserControl x:Class="Unattended_Tool.View.UserControls.Admin.UserControls.Detail" xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006" xmlns:d="http://schemas.microsoft.com/expression/blend/2008" xmlns:dxc="http://schemas.devexpress.com/winfx/2008/xaml/core" xmlns:dxg="http://schemas.devexpress.com/winfx/2008/xaml/grid" xmlns:dxe="http://schemas.devexpress.com/winfx/2008/xaml/editors" xmlns:dxlc="http://schemas.devexpress.com/winfx/2008/xaml/layoutcontrol" mc:Ignorable="d" d:DesignHeight="300" d:DesignWidth="300"&gt; &lt;dxlc:GroupBox MinimizeElementVisibility="Visible" IsManipulationEnabled="True" &gt; &lt;Grid&gt; &lt;Grid.ColumnDefinitions&gt; &lt;ColumnDefinition Width="2*"/&gt; &lt;ColumnDefinition/&gt; &lt;/Grid.ColumnDefinitions&gt; &lt;Grid.RowDefinitions&gt; &lt;RowDefinition/&gt; &lt;/Grid.RowDefinitions&gt; &lt;dxg:GridControl Name="GridControlUser" ItemsSource="{Binding AlleICTSUser, UpdateSourceTrigger=PropertyChanged, Mode=TwoWay}" AutoExpandAllGroups="True" ShowBorder="True" Grid.Column="0" Grid.Row="1" Grid.ColumnSpan="2"&gt; &lt;dxg:GridControl.View&gt; &lt;dxg:TableView Name="tableViewGrid" FocusedRow="{Binding SelecetetUser, UpdateSourceTrigger=PropertyChanged, Mode=TwoWay}" &gt; &lt;dxg:TableView.InputBindings&gt; &lt;KeyBinding Key="Del" Modifiers="Control" Command="{Binding RemoveICTSUserCommand}"/&gt; &lt;KeyBinding Key="N" Modifiers="Control" Command="{Binding AddICTSUserCommand}"/&gt; &lt;/dxg:TableView.InputBindings&gt; &lt;/dxg:TableView&gt; &lt;/dxg:GridControl.View&gt; &lt;dxg:GridControl.Columns&gt; &lt;dxg:GridColumn FieldName="Name" Header="Name"/&gt; &lt;dxg:GridColumn FieldName="Password" Header="Password" AllowEditing="{Binding SelecetetUser.CanEditPassword, UpdateSourceTrigger=PropertyChanged, Mode=TwoWay}"&gt; &lt;dxg:GridColumn.EditSettings&gt; &lt;dxe:PasswordBoxEditSettings IsEnabled="{Binding CanEditPassword}" /&gt; &lt;/dxg:GridColumn.EditSettings&gt; &lt;/dxg:GridColumn&gt; &lt;dxg:GridColumn FieldName="CanEditPassword" Header="CanEdit"&gt; &lt;dxg:GridColumn.EditSettings&gt; &lt;dxe:CheckEditSettings /&gt; &lt;/dxg:GridColumn.EditSettings&gt; &lt;/dxg:GridColumn&gt; &lt;dxg:GridColumn Header="Categorie" FieldName="SelectetProgrammCategorieIds"&gt; &lt;dxg:GridColumn.EditSettings&gt; &lt;dxe:ComboBoxEditSettings ItemsSource="{Binding AlleCategorien, UpdateSourceTrigger=PropertyChanged, Mode=TwoWay}" ValueMember="ID" DisplayMember="Name"&gt; &lt;dxe:ComboBoxEditSettings.StyleSettings&gt; &lt;dxe:CheckedComboBoxStyleSettings/&gt; &lt;/dxe:ComboBoxEditSettings.StyleSettings&gt; &lt;/dxe:ComboBoxEditSettings&gt; &lt;/dxg:GridColumn.EditSettings&gt; &lt;/dxg:GridColumn&gt; &lt;/dxg:GridControl.Columns&gt; &lt;/dxg:GridControl&gt; &lt;/Grid&gt; &lt;/dxlc:GroupBox&gt; </code></pre> <p></p> <p>Ok i Found a way but it isent the True thing it is a "littlebit" dirty i hope there is an other way. My target class must looks like this:</p> <pre><code> using System; using System.Collections.Generic; using System.Linq; using System.Text; using System.ComponentModel; using Unattended_Tool.View.DataStore; using System.Collections.ObjectModel; using System.Xml.Serialization; namespace Unattended_Tool { public class ICTSPrinter : IDataErrorInfo { string _name; string _versionsname; string _location; ObservableCollection&lt;int&gt; _categorie; public ObservableCollection&lt;int&gt; Categorie { get { return _categorie; } set { _categorie = value; } } [XmlIgnore] public object SelectetProgrammCategorieIds { get { return (Object)Categorie; } set { Categories = new ObservableCollection&lt;int&gt;((value as IEnumerable&lt;Object&gt;).ToObservableCollection&lt;int&gt;()) { }; } public string Location { get { return _location; } set { _location = value; } } public string VersionsName { get { return _versionsname; } set { _versionsname = value; } } public string Name { get { return _name; } set { _name = value; } } public string Error { get; set; } public string this[string columnName] { get { Error = string.Empty; switch (columnName) { case "Name": if (string.IsNullOrEmpty(Name)) { Error = "Error"; } break; case "SelectetProgrammCategorieId": if (DataStoreSingelton.Instance.AlleCategories.FirstOrDefault(S =&gt; ((List&lt;int&gt;)SelectetProgrammCategorieIds).FirstOrDefault(s =&gt; s == S.ID) == S.ID) != null) { Error = "Please enter a vaild programm categorie"; } break; default: break; } return Error; } } } } </code></pre> <p>it Seems like DevExpress just accept an object in binding ... i could use an Converter but this would just an Workaround </p> <p>Im using the 12.1.5 version</p>
 

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