Thank you all,
Adding items to treeview programmatically solved my problem.

TreeView worked well when I added items via script.

once again, thank you for all your help!!!

My scenario is loading a hierarchy data from a file and display it into a treeview. And it can be quickly scrolled to a selected node by code (BringIntoView). The problem is, if the child node has too many items (~1500), it takes a few second to expand and scroll to that node. Currently, I don't hav...

Thank you for your explanation.

Do you have any plan to support virtualization on sub-items?

I tried to set those value to TreeView property directly, but I still didn't see any effect.

anyway, thank you, ai_enabled!

Dear ai_enabled, Thank you for your quick response. But I have a question. Does the virtualization always enable? I tried to set IsVirtualizing to True or False , but I can't find any different. <Style TargetType="{x:Type ItemsControl}" BasedOn="{StaticResource NoesisControlStyle}&quo...

Is there any way to use the VirtualizingStackPanel in tree view. It take time to expand a node with 1500 children. How can I improve the expanding time for that node?

Thank you

In WPF I can use the below to right-align the 'help' menu <Menu Height="20" Background="#FFA9D1F4"> <Menu.ItemsPanel> <ItemsPanelTemplate> <DockPanel HorizontalAlignment="Stretch"/> </ItemsPanelTemplate> </Menu.ItemsPanel> <MenuItem Header="File"> <MenuItem He...

Thank you. I tried the new version. It worked well.

Thank you for your reply.

I just make a prototype with NoesisGui, so I used the free version on asset store.
Can I download the trial of version 2.0 ?
Thank you !

I make a simple xaml: <UserControl xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" xmlns:d="http://schemas.microsoft.com/expression/blend/2008" xmlns:mc="http://schemas.openxmlformats.org/mark...