diff --git a/gui.h b/gui.h
index ac122af..e8530ba 100644
--- a/gui.h
+++ b/gui.h
@@ -102,6 +102,10 @@ G_MODULE_EXPORT void cb_detect_detecttype (GtkWidget *widget, gpointer data);
 //
 // histogram elements
 G_MODULE_EXPORT void cb_histogramda_draw(GtkWidget *area, cairo_t *cr, int w, int h, gpointer data);
+G_MODULE_EXPORT void cb_histogramda_motion (GtkWidget *widget, GdkEvent *event, gpointer data);
+G_MODULE_EXPORT void cb_histogramda_btnpress (GtkWidget *widget, gpointer data);
+G_MODULE_EXPORT void cb_histogramda_btnrelease (GtkWidget *widget, gpointer data);
+
 
 
 #ifdef __cplusplus
diff --git a/histogram.cc b/histogram.cc
index d55e202..a26cadd 100644
--- a/histogram.cc
+++ b/histogram.cc
@@ -135,3 +135,21 @@ void histogram_update(VideoFrame *vf) {
 		if (histogram_max < histogram[chan][i]) histogram_max = histogram[chan][i];
 };
 
+
+
+void cb_histogramda_motion (GtkWidget *widget, GdkEvent *event, gpointer data) {
+//	printf ("%s:%d %s\n", __FILE__, __LINE__, __FUNCTION__);
+};
+
+
+void cb_histogramda_btnpress (GtkWidget *widget, gpointer data) {
+	printf ("%s:%d %s\n", __FILE__, __LINE__, __FUNCTION__);
+};
+
+
+void cb_histogramda_btnrelease (GtkWidget *widget, gpointer data) {
+	printf ("%s:%d %s\n", __FILE__, __LINE__, __FUNCTION__);
+};
+
+
+
diff --git a/simpleskycam.ui b/simpleskycam.ui
index 8406c46..172e65c 100644
--- a/simpleskycam.ui
+++ b/simpleskycam.ui
@@ -1,5 +1,5 @@
 <?xml version="1.0" encoding="UTF-8"?>
-<!-- Generated with glade 3.40.0 -->
+<!-- Generated with glade 3.38.2 -->
 <interface>
   <requires lib="gtk+" version="3.18"/>
   <object class="GtkAdjustment" id="detect-pos-adjbright">
@@ -455,7 +455,11 @@
       <object class="GtkDrawingArea" id="histogram-da">
         <property name="visible">True</property>
         <property name="can-focus">False</property>
+        <property name="events">GDK_POINTER_MOTION_MASK | GDK_BUTTON_MOTION_MASK | GDK_BUTTON1_MOTION_MASK | GDK_BUTTON2_MOTION_MASK | GDK_BUTTON3_MOTION_MASK | GDK_BUTTON_PRESS_MASK | GDK_BUTTON_RELEASE_MASK | GDK_STRUCTURE_MASK</property>
+        <signal name="button-press-event" handler="cb_histogramda_btnpress" swapped="no"/>
+        <signal name="button-release-event" handler="cb_histogramda_btnrelease" swapped="no"/>
         <signal name="draw" handler="cb_histogramda_draw" swapped="no"/>
+        <signal name="motion-notify-event" handler="cb_histogramda_motion" swapped="no"/>
       </object>
     </child>
   </object>