custom control and showing

[Noah Roberts <noah roberts eng-software com>]

The show() function is not virtual so can't be overridden to do what I 
want.  I thought maybe on_show() would but it isn't.  I subclassed HBox 
and when that item is shown I want to show all the children associated 
with the new control.  Here is the code for that control, show() is 
called and the debugger steps into my function...it just doesn't show 
the controls.  How do I do what I am trying to do?


#include "InputField.h"

struct InputField::impl
{
 Gtk::Label pre_label;
 Gtk::Label post_label;
 Gtk::Entry input_entry;
 InputField * field;

 impl(std::string const& pre, std::string const& post, InputField * f)
   : pre_label(pre), post_label(post), field(f)
 {
   field->pack_start(pre_label);
   field->pack_start(input_entry);
   field->pack_start(post_label);
 }
};

InputField::InputField(std::string const& pre_label, std::string const& 
post_label)
: pimpl(new impl(pre_label, post_label, this))
{
}

InputField::~InputField() {}

void InputField::on_show()
{
 show_all_children();
}