diff -r b78b6cf02213 -r 99085cfaeabd src/guiutilities.cpp
--- a/src/guiutilities.cpp	Sun Mar 05 20:26:56 2017 +0200
+++ b/src/guiutilities.cpp	Mon Mar 06 00:35:47 2017 +0200
@@ -23,10 +23,6 @@
 #include "lddocument.h"
 #include "mainwindow.h"
 
-GuiUtilities::GuiUtilities (QObject* parent) :
-	QObject (parent),
-	HierarchyElement (parent) {}
-
 /*
  * makeColorIcon
  *
@@ -63,11 +59,11 @@
  *
  * Fills the provided combo box with the colors used in the current document.
  */
-void GuiUtilities::fillUsedColorsToComboBox (QComboBox* box)
+void GuiUtilities::fillUsedColorsToComboBox(Model* model, QComboBox* box)
 {
 	QMap<LDColor, int> frequencies;
 
-	for (LDObject* object : currentDocument()->objects())
+	for (LDObject* object : model->objects())
 	{
 		if (object->isColored() and object->color().isValid())
 		{