[gtkmm] I am stuck with a C++ problem

["Andreas B. Thun" <abt gmx de>]

Hi members,

I have a C++ problem I just cannot solve.
I am new to C++ so maybe you can help easily:

I want to create 10 ParameterLines holding
4 widgets within class ParameterLine.
ParameterLine is derived from HBox.

class Parameters is calling ParameterLine
to create those boxes. Parameters is
derived from VBox, holding all objects
of ParameterLine.

My problem is I cannot see any widget
in my table! Something is wrong with
creation of my objects.
When I create the widgets directly in
main.cpp without classes involved it works....


main.h
Parameters m_Parameters;

main.cpp:
myTable->attach(m_Parameters, 0, 6, 1, 2);


Parameters.h:
-------------
class Parameters : public Gtk::VBox {
  public:
    Parameters();
    virtual ~Parameters();
};


Parameters.cpp:
---------------
// An object of this class represents all ParameterLines in a VBox
Parameters::Parameters()
{
   // Generate ParameterLines
   for (int i=0; i<10; i++)
   {
  	 ParameterLine pLine;
 	 pack_start(pLine);
   }
}


ParameterLine.h:
----------------
class ParameterLine : public Gtk::HBox {
  public:
    ParameterLine();
    virtual ~ParameterLine();

  protected:
	Gtk::Label  m_paramNameLabel;
	Gtk::Entry  m_paramValEntry;
	Gtk::Label  m_paramTypeLabel;
	Gtk::Button m_descButton;
};


ParameterLine.cpp:
------------------
ParameterLine::ParameterLine() : m_descButton("Help")
{
  // View Name of Parameter as Label
  m_paramNameLabel.set_alignment(Gtk::ALIGN_LEFT);
  m_paramNameLabel.set_text("m_name");

  // View Value of Parameter in an entry
  m_paramValEntry.set_text(m_value);
  m_paramValEntry.set_editable("true");

  // View Type of Parameter as Label
  m_paramTypeLabel.set_text("m_type");

  // Pack all widgets into this object
  pack_start(m_paramNameLabel);
  pack_start(m_paramValEntry);
  pack_start(m_paramTypeLabel);
  pack_start(m_descButton);
}



TIA,
Andi