Call event with javascript

I'm trying to call a event with a JavaScript.

But when I click the button that fire the event on the script drop me this error:

JavaScript runtime error: 'newButton_Click' is undefined

this is my script

<script>
    $(".btn-primary .outline .separate").click(function (e) {
        newButton_Click($(this), e)
    })
</script>

and this is the event that I want to fire:

protected void newButton_Click(object sender, EventArgs e)
        {
            ScriptManager.RegisterStartupScript(this, this.GetType(), "Pop", "ModalGood();", true);
            Button Btnclick = (Button)sender;
            var team = Btnclick.Text;
            string name = Btnclick.CommandArgument;

            List.ListUsers listArea = new List.ListUsers();
            List<Data.Area> Area = listArea.AreaList();

            List<Data.Area> ListOfToolsOk = Area.Where(x => x.AREA == name && x.TEAM == team && x.STANDBY == 0).ToList();

            var ToolArea = ListOfToolsOk.Select(x => x.TEAM);
            Grv_Eng.DataSource = ListOfToolsOk;
            Grv_Eng.DataBind();
        }

to fire the event I'm assigning an OnClientClick:

newButton.OnClientClick = "newButton_Click";

I'm using the class to find the button because the id is dynamically and I want that many dynamically buttons make the same event:

newButton.CssClass = "btn-primary outline separate";

[EDITED]

here is where I create the buttons:

protected void Page_Init(object sender, EventArgs e)
    {
        if (AssignClicked)
        {
            ScriptManager.RegisterStartupScript(this, this.GetType(), "Pop", "showAndHide();", true);

            Button Btn_clic = (Button)sender;
            var name = Btn_clic.Text;

            List.ListUsers listArea = new List.ListUsers();
            List<Data.Area> Area = listArea.AreaList();

            List<Data.Area> ListOfEquiposOk = Area.Where(x => x.AREA == name && x.STANDBY == 0).ToList();

            var TeamFCH = ListOfEquiposOk.Select(x => x.TEAM).Distinct().ToList();

            foreach (var team in TeamFCH)
            {
                Button newButton = new Button();
                newButton.CommandName = "Btn" + Convert.ToString(team);
                newButton.ID = "Btn_" + Convert.ToString(team);
                newButton.Text = team;
                newButton.CommandArgument = name;

                newButton.Click += (se, ev) =>
                {

                    ScriptManager.RegisterStartupScript(this, this.GetType(), "Pop", "ModalGood();", true);
                    Button Btnclick = (Button)se;
                    var teams = Btnclick.Text;

                    List<Data.Area> ListOfToolsOk = Area.Where(x => x.AREA == name && x.TEAM == teams && x.STANDBY == 0).ToList();

                    var ToolArea = ListOfToolsOk.Select(x => x.TEAM);
                    Grv_Eng.DataSource = ListOfToolsOk;
                    Grv_Eng.DataBind();

                };

                pan1.Controls.Add(newButton);

                newButton.CssClass = "btn-primary outline separate";
            }
        }
    }

this is the event that fire the Page_Init

protected void DButton(object sender, EventArgs e)
        {
            AssignClicked = true;
            Page_Init(sender, e);
        }

The values to AssignClicked are those:

public bool AssignClicked
        {
            get
            {
                return Convert.ToBoolean(ViewState["AssignClicked"]);
            }
            set
            {
                ViewState["AssignClicked"] = value;
            }
        }