WPF Added button click not firing - wpf

Question

I have a grid of custom buttons with 1 column. When i click on one it creates a new row, with its own custom buttons (depending on which was clicked). When i click on those new button it's supposed to continue but the click event doesn't even fire. It only works on the 1rst column
First set of button :
public ModificationPage(List<Tools.Modele> lm)
{
InitializeComponent();
int index = 0;
lm.ForEach(model =>
{
Console.WriteLine(model.Libelle);
ModifButton b = new ModifButton(model,0,index);
Grid.SetColumn(b,0);
Grid.SetRow(b,index);
b.Click += ButtonClicked;
grid.Children.Add(b);
index++;
});
}
private void ButtonClicked(object sender, RoutedEventArgs e)
{
e.Handled = true; //Without this the event is fired multiples times and add more than 1 row. Removing it doesn't fix the problem
ModifButton b = sender as ModifButton;
Console.WriteLine(b.model);
AddFollowing(b)
}
private async void AddFollowing(ModifButton b)
{
List<List<String>> rep = await SQL.Procedure(Constant.RecupModel, sp);
grid.ColumnDefinitions.Add(new ColumnDefinition());
int index = 0;
rep.ForEach(item =>
{
Modele m = new Modele(int.Parse(item[0]), item[1], item[4]);
ModifButton mb = new ModifButton(m, grid.ColumnDefinitions.Count - 1,index);
b.Click += ButtonClicked; //This one doesn't work
Grid.SetColumn(mb, grid.ColumnDefinitions.Count - 1);
Grid.SetRow(mb, index);
grid.Children.Add(mb);
index++;
});