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Date: Tue, 4 Feb 2014 02:43:08 -0800 (PST)
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Subject: Re: Mouse Clicks in a Drawing Area
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Xref: news.eternal-september.org comp.lang.ada:18366
Date: 2014-02-04T02:43:08-08:00
List-Id: <comp.lang.ada>

>function On_Button_Press (Object : access Gtk_Drawing_Area_Record'Class; 
>event : Gdk_Event) return boolean is 

I have some code that does this and seems to work. I am using:
Add_Events
        (Window1.The_Area,
         Button_Press_Mask or Button_Release_Mask or Button_Motion_Mask or Key_Press_Mask);

and 

function On_The_Button_Press_Event
  (Object : access Gtk_Widget_Record'Class;
   Params : Gtk.Arguments.Gtk_Args)

I see a difference between your attempt and mine, and this last line.

Frank