c GTK3 Text should scoll upward and not hide - c

Question

here is my problem: I just put a gtk_text_view_new() in a gtk_scrolled_window_new(). Now when I write in the textField, at the end of the gtk_widget_set_size_request->high the text is hidden and the whole text does not scroll upwards as I want.
-> The textfield should automatically scroll upwards and show its last line.
#include <gtk/gtk.h>
int main(int argc, char **argv) {
gtk_init(&argc, &argv);
GtkWidget *window;
GtkWidget *myGrid;
GtkWidget *scollwindow;
GtkWidget *textField;
GtkTextBuffer *buffer;
GtkWidget *quitbutton;
//---------------------widgets-------------------------------
window = gtk_window_new(GTK_WINDOW_TOPLEVEL);
quitbutton = gtk_button_new_with_label("QUIT");
myGrid = gtk_grid_new ();
//---------------------textField-------------------------------
textField = gtk_text_view_new ();
buffer = gtk_text_view_get_buffer (GTK_TEXT_VIEW (textField));
gtk_text_buffer_set_text (buffer, "Hello, this is some text, ", -1);
//---------------------insert textField in scrollwindow-------------------------------
scollwindow = gtk_scrolled_window_new (NULL,NULL);
gtk_scrolled_window_add_with_viewport (GTK_SCROLLED_WINDOW (scollwindow), textField);
gtk_scrolled_window_set_policy (GTK_SCROLLED_WINDOW (scollwindow), GTK_POLICY_AUTOMATIC, GTK_POLICY_ALWAYS);
//---------------------widgets size-------------------------------
gtk_widget_set_size_request (scollwindow, 200, 200);
gtk_widget_set_size_request (window, 200, 200);
//---------------------grid attache-------------------------------
gtk_grid_attach(GTK_GRID(myGrid), scollwindow, 0, 0, 1, 1);
gtk_grid_attach(GTK_GRID(myGrid), quitbutton, 0, 1, 1, 1);
//---------------------add to grid-------------------------------
gtk_container_add(GTK_CONTAINER(window), myGrid);
//---------------------signals-------------------------------
g_signal_connect(quitbutton, "clicked", G_CALLBACK(gtk_main_quit), NULL);
g_signal_connect(window, "destroy", gtk_main_quit, NULL);
gtk_widget_show_all(window);
gtk_main();
return 0;
}

Answer 1

Got it, just change line " gtk_scrolled_window_add_with_viewport (GTK_SCROLLED_WINDOW (scollwindow), textField);" to "gtk_container_add (GTK_CONTAINER(scollwindow), textField);"