[gnome-control-center] color: Only attempt to get the main window after the widget has been realized

[Richard Hughes <rhughes src gnome org>]

commit f4228e48cef8555203dc4d976d9c4df73f7b3d25
Author: Richard Hughes <richard hughsie com>
Date:   Wed Jun 1 18:18:18 2011 +0100

    color: Only attempt to get the main window after the widget has been realized
    
    This fixes a critical warning when adding a profile.

 panels/color/cc-color-panel.c |   10 +++++++++-
 1 files changed, 9 insertions(+), 1 deletions(-)
---
diff --git a/panels/color/cc-color-panel.c b/panels/color/cc-color-panel.c
index b97ea4e..e82b2e9 100644
--- a/panels/color/cc-color-panel.c
+++ b/panels/color/cc-color-panel.c
@@ -1947,6 +1947,12 @@ gcm_prefs_connect_cb (GObject *object,
 }
 
 static void
+gcm_prefs_window_realize_cb (GtkWidget *widget, CcColorPanel *prefs)
+{
+  prefs->priv->main_window = gtk_widget_get_toplevel (widget);
+}
+
+static void
 cc_color_panel_get_property (GObject    *object,
                               guint       property_id,
                               GValue     *value,
@@ -2223,7 +2229,9 @@ cc_color_panel_init (CcColorPanel *prefs)
 
   widget = WID (priv->builder, "dialog-vbox1");
   gtk_widget_reparent (widget, (GtkWidget *) prefs);
-  priv->main_window = gtk_widget_get_toplevel (widget);
+  g_signal_connect (widget, "realize",
+                    G_CALLBACK (gcm_prefs_window_realize_cb),
+                    prefs);
 }
 
 void