diff --git a/pw3270.cbp b/pw3270.cbp
index d311e6b..0399f45 100644
--- a/pw3270.cbp
+++ b/pw3270.cbp
@@ -50,6 +50,9 @@
 		<Unit filename="src/main/main.c">
 			<Option compilerVar="CC" />
 		</Unit>
+		<Unit filename="src/main/placeholders.c">
+			<Option compilerVar="CC" />
+		</Unit>
 		<Unit filename="src/main/private.h" />
 		<Unit filename="src/main/tools.c">
 			<Option compilerVar="CC" />
diff --git a/src/include/pw3270.h b/src/include/pw3270.h
index 1a06849..3e4e37c 100644
--- a/src/include/pw3270.h
+++ b/src/include/pw3270.h
@@ -52,6 +52,9 @@
 	#define I_(string) g_intern_static_string (string)
 
 
+	void pw3270_load_placeholders(GtkBuilder * builder);
+
+
 	G_END_DECLS
 
 #endif // PW3270_H_INCLUDED
diff --git a/src/include/pw3270/actions.h b/src/include/pw3270/actions.h
index 150f1d8..0f71357 100644
--- a/src/include/pw3270/actions.h
+++ b/src/include/pw3270/actions.h
@@ -169,6 +169,8 @@
 	/// @brief New simple action from LIB3270's action name.
 	pw3270SimpleAction * pw3270_simple_action_new_from_name(const gchar *source_name, const gchar *name);
 
+	/// @brief Update simple action from LIB3270's property description.
+	void pw3270_simple_action_set_lib3270_property(pw3270SimpleAction *action, const LIB3270_PROPERTY * property);
 
 	//
 	// Dialog action
@@ -197,7 +199,7 @@
 
 	typedef struct _v3270PropertyAction {
 
-		pw3270Action parent;
+		pw3270SimpleAction parent;
 
 		GParamSpec *pspec;
 
@@ -205,7 +207,7 @@
 
 	typedef struct _v3270PropertyActionClass {
 
-		pw3270ActionClass parent_class;
+		pw3270SimpleActionClass parent_class;
 
 	} v3270PropertyActionClass;
 
diff --git a/src/main/placeholders.c b/src/main/placeholders.c
new file mode 100644
index 0000000..d2822d2
--- /dev/null
+++ b/src/main/placeholders.c
@@ -0,0 +1,70 @@
+/*
+ * "Software pw3270, desenvolvido com base nos códigos fontes do WC3270  e X3270
+ * (Paul Mattes Paul.Mattes@usa.net), de emulação de terminal 3270 para acesso a
+ * aplicativos mainframe. Registro no INPI sob o nome G3270. Registro no INPI sob
+ * o nome G3270.
+ *
+ * Copyright (C) <2008> <Banco do Brasil S.A.>
+ *
+ * Este programa é software livre. Você pode redistribuí-lo e/ou modificá-lo sob
+ * os termos da GPL v.2 - Licença Pública Geral  GNU,  conforme  publicado  pela
+ * Free Software Foundation.
+ *
+ * Este programa é distribuído na expectativa de  ser  útil,  mas  SEM  QUALQUER
+ * GARANTIA; sem mesmo a garantia implícita de COMERCIALIZAÇÃO ou  de  ADEQUAÇÃO
+ * A QUALQUER PROPÓSITO EM PARTICULAR. Consulte a Licença Pública Geral GNU para
+ * obter mais detalhes.
+ *
+ * Você deve ter recebido uma cópia da Licença Pública Geral GNU junto com este
+ * programa; se não, escreva para a Free Software Foundation, Inc., 51 Franklin
+ * St, Fifth Floor, Boston, MA  02110-1301  USA
+ *
+ * Este programa está nomeado como main.c e possui - linhas de código.
+ *
+ * Contatos:
+ *
+ * perry.werneck@gmail.com	(Alexandre Perry de Souza Werneck)
+ * erico.mendonca@gmail.com	(Erico Mascarenhas Mendonça)
+ *
+ */
+
+ /**
+  * @brief PW3270 Placeholders management.
+  *
+  */
+
+ #include "private.h"
+ #include <pw3270/application.h>
+ #include <lib3270.h>
+ #include <lib3270/log.h>
+
+/*---[ Implement ]----------------------------------------------------------------------------------*/
+
+ void pw3270_load_placeholders(GtkBuilder * builder) {
+
+	GObject * placeholder = gtk_builder_get_object(builder, "font-select-placeholder");
+
+	if(placeholder && G_IS_MENU(placeholder)) {
+
+		GMenu * font_menu = G_MENU(placeholder);
+
+		gint n_families;
+		PangoFontFamily **families;
+		pango_context_list_families(gdk_pango_context_get_for_screen(gdk_screen_get_default()),&families, &n_families);
+
+		size_t ix;
+		for(ix=0; ix < (size_t) n_families; ix++)
+		{
+			if(!pango_font_family_is_monospace(families[ix]))
+				continue;
+
+			const gchar * family = pango_font_family_get_name(families[ix]);
+			g_autofree gchar * detailed_action = g_strconcat("win.font-family::",family,NULL);
+			g_menu_append(font_menu,family,detailed_action);
+
+		}
+
+	}
+
+
+ }
diff --git a/src/objects/actions/simple.c b/src/objects/actions/simple.c
index 0cb6d30..e8df206 100644
--- a/src/objects/actions/simple.c
+++ b/src/objects/actions/simple.c
@@ -101,6 +101,16 @@
 
  }
 
+ void pw3270_simple_action_set_lib3270_property(pw3270SimpleAction *action, const LIB3270_PROPERTY * property) {
+
+	if(property) {
+		action->parent.name	= property->name;
+		action->tooltip 	= property->summary ? property->summary : property->description;
+		action->group.id	= property->group;
+	}
+
+ }
+
  pw3270SimpleAction * pw3270_simple_action_new_from_lib3270(const LIB3270_ACTION * definition, const gchar *name) {
 
 	if(!definition)
@@ -110,10 +120,11 @@
 
  	pw3270SimpleAction * action = (pw3270SimpleAction *) g_object_new(PW3270_TYPE_SIMPLE_ACTION, NULL);
 
+ 	pw3270_simple_action_set_lib3270_property(action, (const LIB3270_PROPERTY *) definition);
+
  	action->parent.name = name ? name : definition->name;
 	action->icon_name = definition->icon;
 	action->label = definition->label;
-	action->tooltip = definition->summary;
 	action->activate = activate;
 
 	return action;
diff --git a/src/objects/actions/v3270/property.c b/src/objects/actions/v3270/property.c
index 3674a6b..9f89ed6 100644
--- a/src/objects/actions/v3270/property.c
+++ b/src/objects/actions/v3270/property.c
@@ -40,21 +40,22 @@
  #include <stdlib.h>
  #include <pw3270/window.h>
  #include <v3270.h>
+ #include <lib3270/properties.h>
 
  static void v3270PropertyAction_class_init(v3270PropertyActionClass *klass);
  static void v3270PropertyAction_init(v3270PropertyAction *action);
  static GVariant * get_state(GAction *action, GtkWidget *terminal);
  static void change_widget(GAction *object, GtkWidget *from, GtkWidget *to);
 
- G_DEFINE_TYPE(v3270PropertyAction, v3270PropertyAction, PW3270_TYPE_ACTION);
+ G_DEFINE_TYPE(v3270PropertyAction, v3270PropertyAction, PW3270_TYPE_SIMPLE_ACTION);
 
  void v3270PropertyAction_class_init(v3270PropertyActionClass *klass) {
-	klass->parent_class.change_widget = change_widget;
+	klass->parent_class.parent_class.change_widget = change_widget;
  }
 
  static void v3270PropertyAction_init(v3270PropertyAction *action) {
 
- 	action->parent.get_state_property = get_state;
+ 	action->parent.parent.get_state_property = get_state;
 
  }
 
@@ -76,10 +77,11 @@
 	case G_TYPE_STRING:
 		result = g_variant_new_string(g_value_get_string(&value));
 		break;
-	/*
+
 	case G_TYPE_BOOLEAN:
 		result = g_variant_new_boolean(g_value_get_boolean(&value));
 		break;
+	/*
 
 	case G_TYPE_INT:
 		result = g_variant_new_int32(g_value_get_int(&value));
@@ -100,17 +102,6 @@
 
 	g_value_unset (&value);
 
-#ifdef DEBUG
-	if(result)
-	{
-		debug("Action %s set to \"%s\"",g_action_get_name(object),g_variant_get_string(result,NULL));
-	}
-	else
-	{
-		debug("Action %s set to \"%s\"",g_action_get_name(object),"NULL");
-	}
-#endif // DEBUG
-
 	return result;
 
  }
@@ -128,12 +119,27 @@
 	{
 	case G_TYPE_UINT:
 		g_value_set_uint(&value,atoi(g_variant_get_string(parameter,NULL)));
+
 		break;
 
-	/*
 	case G_TYPE_BOOLEAN:
+
+		if(parameter) {
+
+			if(g_variant_is_of_type(parameter,G_VARIANT_TYPE_BOOLEAN))
+				g_value_set_boolean(&value,g_variant_get_boolean(parameter));
+			else
+				g_value_set_boolean(&value,atoi(g_variant_get_string(parameter,NULL)) != 0);
+
+		} else {
+
+			debug("%s: TODO: Toggle property",__FUNCTION__);
+
+		}
+
 		break;
 
+	/*
 	case G_TYPE_INT:
 		break;
 
@@ -170,6 +176,20 @@
 
 	GParamSpec *pspec = g_object_class_find_property(G_OBJECT_GET_CLASS(widget), property_name);
 
+	if(!pspec) {
+
+		g_warning(
+			"Can't find property '%s::%s'",
+			G_OBJECT_TYPE_NAME(G_OBJECT(widget)),
+			property_name
+		);
+
+		return NULL;
+
+	}
+
+	debug("%s: pspec(%s)=%p",__FUNCTION__,property_name,pspec);
+
  	if(~pspec->flags & G_PARAM_READABLE || ~pspec->flags & G_PARAM_WRITABLE || pspec->flags & G_PARAM_CONSTRUCT_ONLY) {
 
 		g_warning(
@@ -183,11 +203,20 @@
 
  	v3270PropertyAction * action = (v3270PropertyAction *) g_object_new(V3270_TYPE_PROPERTY_ACTION, NULL);
 
- 	action->parent.name				= pspec->name;
-	action->parent.types.state		= G_VARIANT_TYPE_STRING;
-	action->parent.types.parameter	= G_VARIANT_TYPE_STRING;
-	action->parent.activate			= activate;
- 	action->pspec					= pspec;
+	pw3270_simple_action_set_lib3270_property(PW3270_SIMPLE_ACTION(action), lib3270_property_get_by_name(pspec->name));
+
+ 	action->parent.parent.name = g_param_spec_get_name(pspec);
+	action->parent.tooltip = g_param_spec_get_blurb(pspec);
+
+	if(pspec->value_type == G_TYPE_BOOLEAN) {
+		action->parent.parent.types.state = G_VARIANT_TYPE_BOOLEAN;
+	} else {
+		action->parent.parent.types.state = G_VARIANT_TYPE_STRING;
+		action->parent.parent.types.parameter = G_VARIANT_TYPE_STRING;
+	}
+
+	action->parent.parent.activate			= activate;
+ 	action->pspec							= pspec;
 
  	pw3270_action_set_terminal_widget(G_ACTION(action), widget);
 
diff --git a/src/objects/application/application.c b/src/objects/application/application.c
index 6b5935e..47bf497 100644
--- a/src/objects/application/application.c
+++ b/src/objects/application/application.c
@@ -32,6 +32,7 @@
  */
 
  #include "private.h"
+ #include <pw3270.h>
  #include <pw3270/application.h>
  #include <pw3270/actions.h>
 
@@ -246,14 +247,6 @@
 			.activate = pw3270_application_generic_activated,
 		},
 
-		/*
-		{
-			.name = "model-number",
-			.activate = model_cb,
-			.parameter_type = "s"
-		}
-		*/
-
 	};
 
 	g_action_map_add_action_entries(
@@ -274,46 +267,36 @@
 	if(pw3270_application_get_ui_style(application) == PW3270_UI_STYLE_CLASSICAL)
 		gtk_application_set_menubar(GTK_APPLICATION (application), G_MENU_MODEL(gtk_builder_get_object (builder, "menubar")));
 
+	pw3270_load_placeholders(builder);
+
 	g_object_unref(builder);
 
  }
 
  void activate(GApplication *application) {
 
+	size_t ix;
+
 	GtkWidget * window = pw3270_application_window_new(GTK_APPLICATION(application));
 
 	// Create terminal widget & associated widget
 	GtkWidget * terminal = pw3270_terminal_new(window);
 
-	/*
-	GAction * action = G_ACTION(v3270_property_action_new(terminal,"model_number"));
-	if(action) {
-		debug("Adding window action \"%s\"",g_action_get_name(action));
-		g_action_map_add_action(G_ACTION_MAP(window),action);
-	}
-	*/
-
-	// https://developer.gnome.org/gnome-devel-demos/stable/menubar.vala.html.en
-
-	/*
-	static const GActionEntry actions[] = {
-
-		{
-			.name = "model-number",
-			.activate = model_cb,
-			.parameter_type = "s",
-			.state = "2"
-		}
-
+	// Create property actions
+	static const gchar * properties[] = {
+		"model-number",
+		"font-family",
+		"dynamic-font-spacing"
 	};
 
-	g_action_map_add_action_entries(G_ACTION_MAP(window),actions,G_N_ELEMENTS(actions),NULL);
-	*/
+	for(ix = 0; ix < G_N_ELEMENTS(properties); ix++) {
 
-	g_action_map_add_action(
-		G_ACTION_MAP(window),
-		v3270_property_action_new(terminal,"model-number")
-	);
+		g_action_map_add_action(
+			G_ACTION_MAP(window),
+			v3270_property_action_new(terminal,properties[ix])
+		);
+
+	}
 
 	// Present the new window
 	pw3270_window_set_current_page(window,0);
diff --git a/src/objects/window/window.c b/src/objects/window/window.c
index b7ea0e5..6532d70 100644
--- a/src/objects/window/window.c
+++ b/src/objects/window/window.c
@@ -170,6 +170,8 @@
 
  GtkWidget * pw3270_application_window_new(GtkApplication * application) {
 
+	size_t ix;
+
 	const gchar * title = _( "IBM 3270 Terminal emulator" );
 
 	g_autoptr(GSettings) settings = pw3270_application_get_settings(G_APPLICATION(application));
@@ -226,7 +228,6 @@
 			g_warning("Unexpected UI");
 
 		}
-
 		g_object_unref(builder);
 
 	}
diff --git a/ui/application.xml b/ui/application.xml
index 5f042a9..e220acb 100644
--- a/ui/application.xml
+++ b/ui/application.xml
@@ -245,8 +245,6 @@
         
           <attribute name="label" translatable="yes">Screen size</attribute>
 
-            <!-- https://developer.gnome.org/gnome-devel-demos/stable/menubar.vala.html.en -->
-
             <item>
               <attribute name="label" translatable="yes">Model 2 - 80x24</attribute>
               <attribute name="action">win.model-number</attribute>
--
libgit2 0.21.2