Index: /trunk/src/org/openstreetmap/josm/gui/preferences/display/GPXSettingsPanel.java
===================================================================
--- /trunk/src/org/openstreetmap/josm/gui/preferences/display/GPXSettingsPanel.java	(revision 11557)
+++ /trunk/src/org/openstreetmap/josm/gui/preferences/display/GPXSettingsPanel.java	(revision 11558)
@@ -281,5 +281,5 @@
         add(colorTypeHeatMapTune, GBC.eol().fill(GBC.HORIZONTAL).insets(5, 0, 0, 5));
 
-        colorTypeHeatMapTune.addPropertyChangeListener(e -> {
+        colorTypeHeatMapTune.addActionListener(e -> {
             final Dimension dim = colorTypeHeatMapTune.getPreferredSize();
             if (null != dim) {