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Using GtkAda handlers

Using GtkAda handlers

(OP)
I am trying to draw a grid on Gtk_Drawing Area. I want that drawing to
appear when then program starts before anything is done.
I can draw that grid and see it but whenever the program redraws the window
it disappears as a whole or in some cases partly. As various sources I found
out that I have to act on the draw signal. As I build my GUI with Glade 3 I
thought I could connect the drawing signal with:

CODE -->

Register_Handler
  (Builder      => Builder,
   Handler_Name => "On_Area_Draw", -- from XML file <signal handler=..>
   Handler      => Sudoku_Callbacks.On_Area_Draw'Access); 

Where I coupled "On_Area_Draw" in Glade with the draw signal in the
Gtk_Drawing_Area. Although This was carried out case Sensitive the program
aborted. The most likely reason therefor is that the handler procedure was:

CODE -->

procedure On_Area_Draw (Object : access Gtkada_Builder_Record'Class); 
where it should have been

CODE -->

function On_Area_Draw (Object : access Gtkada_Builder_Record'Class; Context 
: Cairo.Cairo_Context) return boolean; 
Using the last results in aborting the compilation.

The question now is how should I connect the draw signal to which
function/procedure to get a correct working program?

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