TreeView IsChecked inside the ViewModel

I created a ViewModel for a TreeView that should read the tree structure from an XML document.

<?xml version="1.0"?> <Tables> <StaticGroups> <StaticGroup Name="StaticGroup1"> <Table> <TableName>TableName1</TableName> <TableTag>TableTag1</TableTag> </Table> <SubGroup Name="SubGroup"> <Table> <TableName>TableName2</TableName> <TableTag>TableTag2</TableTag> </Table> </SubGroup> <SubGroup Name="SubGroup1"> <Table> <TableName>TableName2.1</TableName> <TableTag>TableTag2.1</TableTag> </Table> </SubGroup> </StaticGroup> <StaticGroup Name="StaticGroup2"> <Table> <TableName>TableName3</TableName> <TableTag>TableTag3</TableTag> </Table> </StaticGroup> </StaticGroups> <LoadingConditions> <LoadingCondition Name="Loading Condition"> <Table> <TableName>LoadingTable1</TableName> <TableTag>LoadingTableTag1</TableTag> </Table> </LoadingCondition> </LoadingConditions> </Tables> 

these are classes that are responsible for XML deserialization

  static public class Deserialize { static public NavigationTablesXML NavigationXml() { System.IO.StreamReader file = new System.IO.StreamReader(@"..\..\..\..\NavTables.xml"); var serializer = new XmlSerializer(typeof(NavigationTablesXML)); return (NavigationTablesXML)serializer.Deserialize(file); } } #region Navigation Tables [XmlRoot("Tables")] public class NavigationTablesXML { public NavigationTablesXML() { StaticTables = new List<StaticTablesGroup>(); } public List<TablesGroupBase> RootGroups { get { List<TablesGroupBase> merged = new List<TablesGroupBase>(); if (StaticTables != null) merged.AddRange(StaticTables); if (LoadingConditions != null) merged.AddRange(LoadingConditions); return merged; } } [XmlArray("StaticGroups")] [XmlArrayItem("StaticGroup", typeof(StaticTablesGroup))] public List<StaticTablesGroup> StaticTables { get; set; } [XmlArray("LoadingConditions")] [XmlArrayItem("LoadingCondition", typeof(LoadingTablesGroup))] public List<LoadingTablesGroup> LoadingConditions { get; set; } } #endregion Navigation Tables #region Groups Static & Loading [Serializable] public class TablesGroupBase { public TablesGroupBase() { } [XmlAttribute("Name")] public string Name { get; set; } } public class StaticTablesGroup : TablesGroupBase { public StaticTablesGroup():base() { SubGroups = new List<StaticTablesGroup>(); GroupTables = new List<StaticTable>(); } [XmlElement("SubGroup")] public List<StaticTablesGroup> SubGroups { get; set; } [XmlElement("Table", typeof(StaticTable))] public List<StaticTable> GroupTables { get; set; } } [Serializable] public class LoadingTablesGroup : TablesGroupBase { public LoadingTablesGroup():base() { SubGroups = new List<LoadingTablesGroup>(); GroupTables = new List<LoadingTable>(); } [XmlElement("SubGroup")] public List<LoadingTablesGroup> SubGroups { get; set; } [XmlElement("Table", typeof(LoadingTable))] public List<LoadingTable> GroupTables { get; set; } } #endregion Groups Static & Loading #region Individual Table [Serializable] public class TableBase { [XmlElement("TableName")] public string Name { get; set; } [XmlElement("TableTag")] public string Tag { get; set; } } [Serializable] public class StaticTable:TableBase { } [Serializable] public class LoadingTable : TableBase { } #endregion Individual Table 

my viewmodel which should work with treeview

  public class NavigationTablesXMLViewModel:ViewModelBase { private NavigationTablesXML _tables; public NavigationTablesXMLViewModel() { _tables = Deserialize.NavigationXml(); } public List<TablesGroupBase> TreeData { get { return _tables.RootGroups; } } 

Xaml treeview

 <TreeView ItemsSource="{Binding TablesVM.TreeData}" > <TreeView.Resources> <data:SourceConverter x:Key="conv" /> <HierarchicalDataTemplate ItemsSource="{Binding Path=., Converter={StaticResource conv}}" DataType="{x:Type data:LoadingTablesGroup}"> <StackPanel Orientation="Horizontal"> <CheckBox IsChecked="{Binding IsChecked}"/> <TextBlock Text="{Binding Name}"/> </StackPanel> </HierarchicalDataTemplate> <HierarchicalDataTemplate ItemsSource="{Binding Path=., Converter={StaticResource conv}}" DataType="{x:Type data:StaticTablesGroup}"> <StackPanel Orientation="Horizontal"> <CheckBox IsChecked="{Binding IsChecked}"/> <TextBlock Text="{Binding Name}"/> </StackPanel> </HierarchicalDataTemplate> <DataTemplate DataType="{x:Type data:LoadingTable}"> <StackPanel Orientation="Horizontal"> <CheckBox IsChecked="{Binding IsChecked}"/> <TextBlock Text="{Binding Name}"/> </StackPanel> </DataTemplate> <DataTemplate DataType="{x:Type data:StaticTable}"> <StackPanel Orientation="Horizontal"> <CheckBox IsChecked="{Binding IsChecked}"/> <TextBlock Text="{Binding Name}"/> </StackPanel> </DataTemplate> </TreeView.Resources> </TreeView> 

How can you make isChecked triggered inside the ViewModel (NavigationTablesXMLViewModel) and when you click on the parent node, all children are marked. I added the isChecked property to the ViewModel (NavigationTablesXMLViewModel) but it certainly does not work