How to work with checkboxes in unbound mode in WPF TreeView?

This example describes how to work with check boxes in unbound mode in WPF TreeView (SfTreeView).

You can directly set the checkbox state by setting the TreeViewNode.IsChecked property value while creating nodes.

<Window 
    x:Class="TreeNodeWithCheckBoxDemo.Window1"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    xmlns:local="clr-namespace:TreeNodeWithCheckBoxDemo"
    xmlns:syncfusion="http://schemas.syncfusion.com/wpf"
    xmlns:Engine="clr-namespace:Syncfusion.UI.Xaml.TreeView.Engine;assembly=Syncfusion.SfTreeView.WPF"
    Title="Node With CheckBox"
    Width="450"
    Height="500"
    Icon="App.ico"
    WindowStartupLocation="CenterScreen">
    <Grid>
        <syncfusion:SfTreeView x:Name="sfTreeView"
                                Width="400"
                                Margin="10,10,10,10"
                                BorderThickness="1"
                                BorderBrush="LightGray"
                                IsAnimationEnabled="True"
                                ItemTemplateDataContextType="Node" 
                                CheckBoxMode="Recursive" >
            <syncfusion:SfTreeView.Nodes>
                <Engine:TreeViewNode Content="Grains" IsExpanded="True" IsChecked="True">
                    <Engine:TreeViewNode.ChildNodes>
                        <Engine:TreeViewNode Content="Cereals" IsExpanded="True">
                            <Engine:TreeViewNode.ChildNodes>
                                <Engine:TreeViewNode Content="Rice" IsChecked="True"/>
                                <Engine:TreeViewNode Content="Barley"/>
                            </Engine:TreeViewNode.ChildNodes>
                        </Engine:TreeViewNode>
                        <Engine:TreeViewNode Content="Oilseeds">
                            <Engine:TreeViewNode.ChildNodes>
                                <Engine:TreeViewNode Content="Safflower" IsChecked="True"/>
                            </Engine:TreeViewNode.ChildNodes>
                        </Engine:TreeViewNode>
                    </Engine:TreeViewNode.ChildNodes>
                </Engine:TreeViewNode>
                <Engine:TreeViewNode Content="Fruits" IsExpanded="true">
                    <Engine:TreeViewNode.ChildNodes>
                        <Engine:TreeViewNode Content="Orange" IsChecked="True"/>
                        <Engine:TreeViewNode Content="Apples" IsExpanded="true"/>
                    </Engine:TreeViewNode.ChildNodes>
                </Engine:TreeViewNode>
                <Engine:TreeViewNode Content="Vegetables" IsExpanded="true" IsChecked="True">
                    <Engine:TreeViewNode.ChildNodes>
                        <Engine:TreeViewNode Content="Root Vegetables" IsExpanded="true">
                            <Engine:TreeViewNode.ChildNodes>
                                <Engine:TreeViewNode Content="Potato" IsChecked="True"/>
                                <Engine:TreeViewNode Content="Carrot"/>
                            </Engine:TreeViewNode.ChildNodes>
                        </Engine:TreeViewNode>
                        <Engine:TreeViewNode Content="Podded">
                            <Engine:TreeViewNode.ChildNodes>
                                <Engine:TreeViewNode Content="Peanut" IsChecked="True"/>
                                <Engine:TreeViewNode Content="Lentil"/>
                            </Engine:TreeViewNode.ChildNodes>
                        </Engine:TreeViewNode>
                    </Engine:TreeViewNode.ChildNodes>
                </Engine:TreeViewNode>
            </syncfusion:SfTreeView.Nodes>
            <syncfusion:SfTreeView.ItemTemplate>
                <DataTemplate>
                    <Grid>
                        <CheckBox x:Name="CheckBox" FocusVisualStyle="{x:Null}"
                                            IsChecked="{Binding IsChecked, Mode=TwoWay}" Content="{Binding Content}"/>
                    </Grid>
                </DataTemplate>
            </syncfusion:SfTreeView.ItemTemplate>
        </syncfusion:SfTreeView>
    </Grid>
</Window>