diff --git a/src/window_gui.h b/src/window_gui.h
--- a/src/window_gui.h
+++ b/src/window_gui.h
@@ -704,7 +704,7 @@ public:
 };
 
 /**
- * Data structure for a window opened from a toolbar
+ * Base class for windows opened from a toolbar.
  */
 class PickerWindowBase : public Window {
 
@@ -714,6 +714,11 @@ public:
 		this->parent = parent;
 	};
 
+	PickerWindowBase(Window *parent) : Window()
+	{
+		this->parent = parent;
+	};
+
 	virtual ~PickerWindowBase();
 };