Treeview selectedItem highlight on startup

Question

I have a treeview in my xaml as below. I use the selected item by using interactivity and bind the event.

    <DataTemplate x:Key="TreeTemplate">
        <TreeView Name="TreeView" ItemsSource="{Binding ItemList}" ItemTemplate="{StaticResource ChildTemplate}">
            <i:Interaction.Triggers>
                <i:EventTrigger EventName="SelectedItemChanged">
                    <i:InvokeCommandAction
                        Command="{Binding SetSelectedItemCommand}"
                        CommandParameter="{Binding SelectedItem, ElementName=TreeView}"/>
                </i:EventTrigger>
            </i:Interaction.Triggers>
        </TreeView>
    </DataTemplate>

This all works very well except when by application loads for the first time. Even if SelectedItem property is set on startup, the treeview does not show the item highlighted unless a mouse event is fired which causes SelectedItemChanged event. Any ideas as as to how can I do this?

My datacontext is in code behind of the xaml

        myView = new MyViewModel();    
        this.DataContext = myView;

        InitializeComponent();

Nawed Nabi Zada Nawed Nabi Zada · Accepted Answer · 2015-12-21T14:59:08

This will work:

<DataTemplate x:Key="TreeTemplate">
    <TreeView Name="TreeView" ItemsSource="{Binding ItemList}" ItemTemplate="{StaticResource ChildTemplate}">
        <i:Interaction.Triggers>
            <i:EventTrigger EventName="SelectedItemChanged">
                <i:InvokeCommandAction
                    Command="{Binding SetSelectedItemCommand}"
                    CommandParameter="{Binding SelectedItem, ElementName=TreeView}"/>

             <i:EventTrigger EventName="Loaded">
                <i:InvokeCommandAction
                    Command="{Binding SetSelectedItemCommand}"
                    CommandParameter="{Binding SelectedItem, ElementName=TreeView}"/>
            </i:EventTrigger>
        </i:Interaction.Triggers>
    </TreeView>
</DataTemplate>

Treeview selectedItem highlight on startup

1 Answers