wxGTK: Another layout problem

[Tommy W]

So this is ANOTHER (new) question.
I have 1 panel and 2 spinctrls/stattext in this layout

________
| panel |
|_______|
|___|___| <-- 2 spin ctrls/stattext

What I want to do is make the panel expand and become as large as possible.
I make the layout happen using wxFlexGridSizer
topSizer and controlSizer

topSizer har growable row/col (0)

worth mentioning is that all this is bundled together in a wxControl which I 
call ClockCtrl, which is in it's turn placed in a 
wxBoxSizer->Add(clockCtrl,0,wxEXPAND);

the clockctrl has green background so that I can actually see that all the 
space I want to be used IS used. and it is.
The PROBLEM is that the PANEL in the clockctrl (mentioned above) is NOT 
expanded to become as large as possible..

I get a layout like this instead

________
| panel |
|_______|
|___|___|  <-- 2 spinctrls/stattext
|           |  
|_______|    <-- empty space (green, this is actually part of the ClockCtrl)

... what the heck am I doing wrong?

this is the code for the ClockCtrl

ClockCtrl::ClockCtrl(wxWindow *parent, wxWindowID id, const wxDateTime 
&d,const wxPoint &pos, const wxSize &size, long style):
wxControl(parent,id,pos,size,style,wxDefaultValidator,(const wxString &) 
"ClockCtrl")
{
   SetBackgroundColour(*wxGREEN);
   wxFlexGridSizer *topSizer = new wxFlexGridSizer(0,1,0,0);
   topSizer->AddGrowableRow(0);
   topSizer->AddGrowableCol(0);

   clockPanel = new ClockPanel(this,1,wxDefaultPosition,wxDefaultSize);
   clockPanel->SetMinSize(wxSize(50,50));
   topSizer->Add(clockPanel,1,wxALIGN_CENTER);

   wxFlexGridSizer *controlSizer = new wxFlexGridSizer(2,2,0,0);
   topSizer->Add(controlSizer,0);

   wxStaticText *hourText = new wxStaticText(this,wxID_ANY,_("Hour"));
   controlSizer->Add(hourText,1,wxEXPAND|wxGROW|wxALIGN_BOTTOM|wxALIGN_LEFT);

   wxSpinCtrl *spinHour = new 
wxSpinCtrl(this,4,wxEmptyString,wxDefaultPosition,wxDefaultSize,wxSP_WRAP,0,23,clockPanel->GetTime().GetHour());
   spinHour->Connect(wxEVT_COMMAND_SPINCTRL_UPDATED, 
wxSpinEventHandler(ClockCtrl::OnSpin), NULL,this);
   controlSizer->Add(spinHour,0);

   wxStaticText *minuteText = new wxStaticText(this,wxID_ANY,_("Minute"));
   controlSizer->Add(minuteText,1,wxEXPAND|wxALIGN_BOTTOM|wxALIGN_LEFT);

   wxSpinCtrl *spinMinute = new 
wxSpinCtrl(this,5,wxEmptyString,wxDefaultPosition,wxDefaultSize,wxSP_WRAP,0,59,clockPanel->GetTime().GetMinute());
   spinMinute->Connect(wxEVT_COMMAND_SPINCTRL_UPDATED, 
wxSpinEventHandler(ClockCtrl::OnSpin), NULL,this);
   controlSizer->Add(spinMinute,0,wxALIGN_CENTER_VERTICAL);

   SetSizer(topSizer);

   topSizer->Fit(this);
   topSizer->Layout();
   topSizer->SetSizeHints(this);
   Layout();
}