There is a bug about selecting selected sub items between different menu item will not trigger the SelectionChanged event
Here is my improvment about this:
https://github.com/Freesia810/DropdownMenu

Hi,
I am a complete beginner in WPF and C# in general. I really like your idea and was wondering how I could add my own functionality to the Sub Items. For example I want to load a command on my DataGrid when I select a Sub Item from the Menu. How do I do that?

Thanks!

I have added the references of MaterialDesignColors and MaterialDesignThemes, but not getting PrimaryHueMidBrush or other value of colors while specifying it in StaticResource (MainWindow.xaml)

i found this error, i dont know why. in * . . . public UserControlMenuItem(ItemMenu itemMenu) . . . .*
i just repo your code and its really work. But, when im trying it myself. i dont know how to fix it. can you help me. please.

Error CS0051 Inconsistent accessibility: parameter type 'ItemMenu' is less accessible than method 'UserControlMenuItem.UserControlMenuItem(ItemMenu)'

this is my code :

using BUMDES.ViewModels;
using System.Windows;
using System.Windows.Controls;

namespace BUMDES
{
public partial class UserControlMenuItem : UserControl
{
public UserControlMenuItem(ItemMenu itemMenu)
{
InitializeComponent();
ExpanderMenu.Visibility = itemMenu.SubItems == null ? Visibility.Collapsed : Visibility.Visible;
ListViewItemMenu.Visibility = itemMenu.SubItems == null ? Visibility.Visible : Visibility.Collapsed;
this.DataContext = itemMenu;
}
}
}

im new in programer in WPF and still learn