Make sure all widgets have a parent.

src/gui/widgets/grid.cpp

@@ -99,7 +99,8 @@ void tgrid::set_child(twidget* widget, const unsigned row,
 }
 
 twidget* tgrid::swap_child(
-		const std::string& id, twidget* widget, const bool recurse)
+		const std::string& id, twidget* widget, const bool recurse,
+		twidget* new_parent)
 {
 	assert(widget);
 
@@ -124,7 +125,7 @@ twidget* tgrid::swap_child(
 		// When find the widget there should be a widget.
 		twidget* old = child.widget();
 		assert(old);
-		old->set_parent(NULL);
+		old->set_parent(new_parent);
 
 		widget->set_parent(this);
 		child.set_widget(widget);

src/gui/widgets/grid.hpp

@@ -133,13 +133,15 @@ public:
 	 * @param id                  The id of the widget to free.
 	 * @param widget              The widget to put in the grid.
 	 * @parem recurse             Do we want to decent into the child grids.
+	 * @parem new_parent          The new parent for the swapped out widget.
 	 *
 	 * returns                    The widget which got removed (the parent of
 	 *                            the widget is cleared). If no widget found
 	 *                            and thus not replace NULL will returned.
 	 */
 	twidget* swap_child(
-		const std::string& id, twidget* widget, const bool recurse);
+		const std::string& id, twidget* widget, const bool recurse,
+		twidget* new_parent = NULL);
 
 	/**
 	 * Removes and frees a widget in a cell.

src/gui/widgets/vertical_scrollbar_container.cpp

@@ -409,7 +409,7 @@ void tvertical_scrollbar_container_::show_scrollbar(const bool show)
 
 		tgrid* tmp = new tgrid();
         scrollbar_grid_ = dynamic_cast<tgrid*>
-			(grid().swap_child("_scrollbar_grid", tmp, true));
+			(grid().swap_child("_scrollbar_grid", tmp, true, this));
 	}
 }
 

src/gui/widgets/window.cpp

@@ -109,9 +109,11 @@ twindow::twindow(CVideo& video,
 	load_config();
 
 	tooltip_.set_definition("default");
+	tooltip_.set_parent(this);
 	tooltip_.set_visible(false);
 
 	help_popup_.set_definition("default");
+	help_popup_.set_parent(this);
 	help_popup_.set_visible(false);
 }