[gtkada] Gtk.Containers and derived types

[Tony Gair]

I'm trying to use the procedure Gtk.Container.Remove on a hbox container 
and I get a compiler error because it is expecting a Gtk.Container 
access type rather than the Hbox I try to use in the parameter.

<b>120:59</b>    expected an access type with designated private type 
&quot;Gtk_Container_Record&quot; defined at gtk-container.ads:44 Builder 
results000120

<b> </b>         found an access type with designated type 
&quot;Gtk_Hbox&quot; defined at <span 
color="blue"><u>gtk-box.ads:67</u></span> Builder results000067

Is there a way to reference the container part of the hbox so I can 
remove the widget
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