Wpf mvvm ObservableCollection doesn't update listView

I want to update a listview in View when adding/removing an entry in viewmodel.

When running to curser I can see, that my Categories_GetActive is updated with row 4(5,6,7 and so on) but it doesn't show up in my ListView.

So I miss something (I think) in binding the ListView to the ObservableCollection in the ViewModel. But cann't see what.

When starting the page, the 3 rows from db is in the listview so I know I have the correct binding

Can anyone please help me to see, what I'm doing wrong?

The UpdateSourceTrigger=PropertyChanged in the View I added to see, if that would help to update but no.

If You want the full code, just say so. There is nothing to hide in my code :-)

Best regards

Simsen :-)

My Listview

"LivCategories" ItemsSource="{Binding Categories_GetActive, UpdateSourceTrigger=PropertyChanged}"
SelectedItem="{Binding SelectedCategory}" Grid.Row="0" Grid.Column="0">
"Id" Width="50" DisplayMemberBinding="{Binding CategoryId}"/>
"Navn" Width="250" DisplayMemberBinding="{Binding CategoryName}"/>
"Global" Width="50" DisplayMemberBinding="{Binding CategoryIsGlobal}"/>
"Project" Width="150" DisplayMemberBinding="{Binding ProjectName}"/>
"ProjectId" Width="0" DisplayMemberBinding="{Binding ProjectId}" />

My ViewModel

public CategoryViewModel()
{
LoadCategories();
LoadProjects();
CmdSave = new MyICommand(SaveChanges);
CmdSaveNew = new MyICommand(SaveNew);
}
private ObservableCollection _categories_GetAll;
public ObservableCollection Categories_GetAll
{
get
{
return _categories_GetAll;
}
set
{
_categories_GetAll = value;
OnPropertyChanged("Categories_GetAll");
}
}
//Active
private ObservableCollection _categories_GetActive;
public ObservableCollection Categories_GetActive
{
get
{
return _categories_GetActive;
}
set
{
_categories_GetActive = value;
OnPropertyChanged("Categories_GetActive");
}
}
//Inactive
private ObservableCollection _categories_GetInactive;
public ObservableCollection Categories_GetInactive
{
get
{
return _categories_GetInactive;
}
set
{
_categories_GetInactive = value;
OnPropertyChanged("Categories_GetInactive");
}
}
//Load Categories
public void LoadCategories()
{
DalCategory dalCategory = new DalCategory();
var categories = dalCategory.GetCategories();
if (categories != null)
{
//All
List Categories_GetAllList = categories;
Categories_GetAll = new ObservableCollection(Categories_GetAllList);
//Active
List Categories_GetActiveList = categories.Where(x => x.CategoryIsObsolete == false).ToList();
Categories_GetActive = new ObservableCollection(Categories_GetActiveList);
//Inactive
List Categories_GetInactiveList = categories.Where(x => x.CategoryIsObsolete == true).ToList();
Categories_GetInactive = new ObservableCollection(Categories_GetInactiveList);
}
}

In this method I add a row to the Categories_GetCative

Here I make my PropertyChanged