diff --git a/src/RoleEditor/MainWindow.xaml b/src/RoleEditor/MainWindow.xaml
index b7953c7..7f3fd26 100644
--- a/src/RoleEditor/MainWindow.xaml
+++ b/src/RoleEditor/MainWindow.xaml
@@ -4,6 +4,7 @@
         xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
         xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
         xmlns:local="clr-namespace:RoleEditor"
+        xmlns:xctk="http://schemas.xceed.com/wpf/xaml/toolkit"
         mc:Ignorable="d"
         Title="Bremen calling admin editor" Height="650" Width="800" Icon="Resources/lock_preferences.ico" Loaded="Window_Loaded">
     <Grid>
@@ -66,7 +67,7 @@
                             <TextBox x:Name="textBoxParticipantPostalCode" Grid.Row="2" Grid.Column="2" Margin="2" VerticalContentAlignment="Center" />
                             <TextBox x:Name="textBoxParticipantCity" Grid.Row="3" Grid.Column="2" Margin="2" VerticalContentAlignment="Center" />
                             <CheckBox x:Name="checkboxParticipantActive" Grid.Row="4" Grid.Column="2" VerticalAlignment="Center" />
-                            <ComboBox x:Name="comboBoxParticipantType" Grid.Row="5" Grid.Column="2" Margin="2" SelectedValuePath="Key" DisplayMemberPath="Value" />
+                            <xctk:CheckComboBox x:Name="comboBoxParticipantType" Grid.Row="5" Grid.Column="2" Margin="2" SelectedValue="Key" DisplayMemberPath="Value" />
                             <TextBox x:Name="textBoxParticipantCreated" Grid.Row="6" IsReadOnly="True" IsEnabled="False" Grid.Column="2" Margin="2" VerticalContentAlignment="Center" />
                             <TextBox x:Name="textBoxParticipantModified" Grid.Row="7" IsReadOnly="True" IsEnabled="False" Grid.Column="2" Margin="2" VerticalContentAlignment="Center" />
                             <Button x:Name="buttonParticipantSave" Grid.Row="8" Grid.Column="2" Click="buttonParticipantSave_Click" Margin="2">
diff --git a/src/RoleEditor/MainWindow.xaml.cs b/src/RoleEditor/MainWindow.xaml.cs
index 24415f6..3ce2d2d 100644
--- a/src/RoleEditor/MainWindow.xaml.cs
+++ b/src/RoleEditor/MainWindow.xaml.cs
@@ -209,7 +209,18 @@ namespace RoleEditor
                 p.Street = this.textBoxParticipantStreet.Text.Trim();
                 p.PostalCode = this.textBoxParticipantPostalCode.Text.Trim();
                 p.City = this.textBoxParticipantCity.Text.Trim();
-                p.Type = (Participant.ParticipantType) Enum.Parse(typeof(Participant.ParticipantType), (string) this.comboBoxParticipantType.SelectedValue);
+
+                p.Type = 0;
+                for(int i = 0; i < this.comboBoxParticipantType?.SelectedItems.Count; i++)
+                {
+                    object? v = this.comboBoxParticipantType?.SelectedItems[i];
+                    if (v != null)
+                    {
+                        KeyValuePair<string, string> kvp = (KeyValuePair<string, string>)v;
+                        Participant.ParticipantType pType = (Participant.ParticipantType)Enum.Parse(typeof(Participant.ParticipantType), kvp.Key);
+                        p.SetFlag(true, pType);
+                    }                                       
+                }                
                 await p.Save(_dbManager);
                 this.listBoxParticipant.ItemsSource = null;
                 this.listBoxParticipant.ItemsSource = _participants;
@@ -357,7 +368,7 @@ namespace RoleEditor
 
         private async void listBoxParticipant_SelectionChanged(object sender, SelectionChangedEventArgs e)
         {
-            Participant? p = this.listBoxParticipant.SelectedItem as Participant;
+            Participant? p = this.listBoxParticipant.SelectedItem as Participant;            
             
             this.textBoxParticipantName.Text = (p != null) ? p.Name : string.Empty;
             this.textBoxParticipantStreet.Text = (p != null) ? p.Street : string.Empty;
@@ -366,8 +377,24 @@ namespace RoleEditor
             //  this.checkboxParticipantActive.Checked = (p != null) ? p.
             this.textBoxParticipantCreated.Text = (p != null) ? p.Created.ToString() : string.Empty;
             this.textBoxParticipantModified.Text = (p != null) ? p.Modified.ToString() : string.Empty;
-            this.comboBoxParticipantType.SelectedValue = (p != null) ? p.Type : 0;
 
+            this.comboBoxParticipantType.SelectedItems.Clear();
+            if (p != null)
+            {
+                foreach (Participant.ParticipantType pType in Enum.GetValues(typeof(Participant.ParticipantType)))
+                {
+                    if (p.IsFlagSet(pType))
+                    {
+                        foreach (KeyValuePair<string, string> kvp in this.comboBoxParticipantType.Items)
+                        {
+                            if (kvp.Key.Equals(pType.ToString()))
+                            {
+                                this.comboBoxParticipantType.SelectedItems.Add(kvp);
+                            }
+                        }
+                    }
+                }
+            }
             // -> load users for this participant selection
             this._users.Clear();
             if (p != null)
@@ -556,7 +583,7 @@ namespace RoleEditor
 
         #endregion
 
-        #region private static helper
+        #region private static helper        
 
         private static BitmapImage? LoadImage(byte[] imageData)
         {
diff --git a/src/brecal.model/Participant.cs b/src/brecal.model/Participant.cs
index b9d5954..4773034 100644
--- a/src/brecal.model/Participant.cs
+++ b/src/brecal.model/Participant.cs
@@ -1,11 +1,8 @@
-using System;
-using System.Collections.Generic;
+// Copyright (c) 2023- schick Informatik
+// Description: Container for participants (Teilnehmer)
+
 using System.ComponentModel;
 using System.Data;
-using System.Linq;
-using System.Reflection.PortableExecutable;
-using System.Text;
-using System.Threading.Tasks;
 
 namespace brecal.model
 {
@@ -46,7 +43,7 @@ namespace brecal.model
 
         public string? City { get; set; }
 
-        public ParticipantType Type { get; set;}
+        public uint Type { get; set;}
 
         public uint Flags { get; set; }
 
@@ -74,7 +71,7 @@ namespace brecal.model
                 if (!reader.IsDBNull(2)) p.Street = reader.GetString(2);
                 if (!reader.IsDBNull(3)) p.PostalCode = reader.GetString(3);
                 if (!reader.IsDBNull(4)) p.City = reader.GetString(4);
-                if (!reader.IsDBNull(5)) p.Type = (ParticipantType) reader.GetInt32(5);
+                if (!reader.IsDBNull(5)) p.Type = (uint) reader.GetInt32(5);
                 if (!reader.IsDBNull(6)) p.Flags = (uint)reader.GetInt32(6);
                 if (!reader.IsDBNull(7)) p.Created = reader.GetDateTime(7);
                 if (!reader.IsDBNull(8)) p.Modified = reader.GetDateTime(8);
@@ -100,7 +97,7 @@ namespace brecal.model
 
         public override void SetCreate(IDbCommand cmd)
         {
-            cmd.CommandText = "INSERT INTO participant (name, street, postal_code, city, flags) VALUES ( @NAME, @STREET, @POSTAL_CODE, @CITY, @TYPE, @FLAGS)";
+            cmd.CommandText = "INSERT INTO participant (name, street, postal_code, city, type, flags) VALUES ( @NAME, @STREET, @POSTAL_CODE, @CITY, @TYPE, @FLAGS)";
             this.SetParameters(cmd);
         }
 
@@ -171,13 +168,13 @@ namespace brecal.model
 
         public bool IsFlagSet(ParticipantType flag)
         {
-            return (this.Flags & (uint)flag) != 0;
+            return (this.Type & (uint)flag) != 0;
         }
 
         public void SetFlag(bool value, ParticipantType flag)
         {
-            if (value) this.Flags |= (uint)flag;
-            else this.Flags &= (uint)~flag;
+            if (value) this.Type |= (uint)flag;
+            else this.Type &= (uint)~flag;
         }
 
         #endregion
diff --git a/src/brecal.model/brecal.model.licenseheader b/src/brecal.model/brecal.model.licenseheader
new file mode 100644
index 0000000..4ca98a8
--- /dev/null
+++ b/src/brecal.model/brecal.model.licenseheader
@@ -0,0 +1,15 @@
+extensions: designer.cs generated.cs
+extensions: .cs .cpp .h
+// Copyright (c) 2023- schick Informatik
+// Description:
+
+extensions: .aspx .ascx
+<%-- 
+Copyright (c) 2023- schick Informatik
+--%>
+extensions: .vb
+'Sample license text.
+extensions:  .xml .config .xsd
+<!--
+Sample license text.
+-->
\ No newline at end of file