Problems accessing static member variable from static member function

[montylee]

I have a class with a static variable of type QComboBox *. I have created a static member function from which i want to return this static variable. Here is the sample code:

Header code

Class TestPage : public QWidget
{
---
---
---
public:
       static QComboBox *getTestCombo ();
 
private:
       static QComboBox *sm_pTestCombo;
};

Class TestPage : public QWidget
{
---
---
---
public:
       static QComboBox *getTestCombo ();

private:
       static QComboBox *sm_pTestCombo;
};

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CPP code

QComboBox * TestPage::getTestCombo ()
{
       return sm_pTestCombo;
}

QComboBox * TestPage::getTestCombo ()
{
       return sm_pTestCombo;
}

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I am getting the following linking error:

undefined reference to 'TestPage::sm_pTestCombo'

Any ideas?