private void newtask_window_create()
        {
            newtask = new NewTask(bolayer);
            newtask.close_button.Click += notify_close_button_Click;

            newtask.sendbutton.Click += sendbutton_Click;


            BigStackpanel.Children.Add(newtask);
        }
        private void Notify_assigntask_Click(object sender, EventArgs e)
        {
            before_side_window(0);
            newtask = new NewTask(bolayer);
            newtask.close_button.Click += windo_by_icon_close_button_Click;

            newtask.sendbutton.Click += sendbutton_Click;

            newtask.bar_border.MouseDown += bar_border_MouseDown;
            BigStackpanel.Children.Add(newtask);

            this.WindowState   = WindowState.Normal;
            this.ShowInTaskbar = true;
        }