WPF-Blend How can I edit Item Template or Control Template in designer in Blend VS 2022

Question

Hello everyone,

I have a treeview:

<TreeView ItemTemplate="{DynamicResource AccountsTreeViewItemTemplate}" />  

and here is the template:

   <HierarchicalDataTemplate x:Key="AccountsTreeViewItemTemplate" ItemsSource="{Binding Children}" DataType="{x:Type local:AccountHierarchy}"  >  
        <Grid >  
            <Grid.ColumnDefinitions>  
                <ColumnDefinition Width="1*" />  
                <ColumnDefinition Width="1*" />  
                  
            </Grid.ColumnDefinitions>  
            <TextBlock Text="{Binding Name}" Grid.Column="1" />  
            <TextBlock Text="{Binding Id}"  />  
  
        </Grid>  
    </HierarchicalDataTemplate>  

The template works, but I need to edit it in the designer to edit the visual states, the problem is:

1. Edit current template is disabled despite it is assigned to as displayed in code above

2. Can't find a way to edit the template visually in designer,

(I tried editing template of other controls e.g. button, but also couldn't find a way also)

I am using Blend for vs 2022, version 17.05