[Glade-users] Problem with GtkTextView and GtkTextBuffer

I have a problem managing the GtkTextView widget in an application I 
built with Glade3.

// I define a structure with all the data I'll need in my callback 

typedef struct _ChData ChData;
struct _ChData
     GtkWidget *window;
     GtkWidget *connect_button;
     GtkWidget *serial_data;

// In my main I allocate the struct data and I get the objects from the 
glade file:
ChData *data;
GtkBuilder *builder_handler;

data = g_slice_new(ChData);

builder_handler = gtk_builder_new();
gtk_builder_add_from_file(builder_handler, GUI_XML_FILENAME, NULL);

data->window = GTK_WIDGET(gtk_builder_get_object(builder_handler, 
data->connect_button = 
GTK_WIDGET(gtk_builder_get_object(builder_handler, "connect_button"));
data->serial_data = GTK_WIDGET(gtk_builder_get_object(builder_handler, 

// Then I connect the signals, show the UI and go in the main loop

gtk_builder_connect_signals(builder_handler, data);



// Now, in one callback function I'd like to write some text in the text 

// I get the buffer from the GtkTextView widget
GtkTextBuffer *serial_buffer_ptr;

serial_buffer_ptr = 

// but this line triggers the following error:
GLib-GObject-WARNING **: invalid uninstantiatable type `<unknown>' in 
cast to `GtkTextView'

Where am I doing wrong?
Manuel Ferrero
R&D department

Reer SpA        
Tel.  +39 011 2482215
Fax. +39 011 859867

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