"Undefined Reference Error" in Tizen Native Application

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I want to add a background image on a form in Tizen platform. I have following two classes:

first class:

class BaseForm1
: public Tizen::Ui::Controls::Form
, public Tizen::Ui::IActionEventListener
, public Tizen::Ui::Controls::IFormBackEventListener
{
public:
BaseForm1();
virtual ~BaseForm1();

    virtual bool Initialize(void) = 0;
    virtual result OnInitializing(void);
    bool SetFooter(void);
    virtual void OnActionPerformed(const Tizen::Ui::Control& source, int actionId);
    virtual void OnFormBackRequested(Tizen::Ui::Controls::Form& source) ;

protected:
    static const int ID_EXIT = 100;
};

second class:

class CreateForm1:
public BaseForm1,
public Tizen::Ui::IItemEventListener

{

protected:


public:
CreateForm1();
virtual ~CreateForm1();
virtual bool Initialize(void);
virtual result OnInitializing(void);
virtual void OnActionPerformed(const Tizen::Ui::Control& source, int actionId);
virtual void OnItemStateChanged(const Tizen::Ui::Control& source, int index, int itemId, Tizen::Ui::ItemStatus status);
virtual result OnDraw(void);
};

In the second class I use BaseForm1::OnInitializing() method in OnInitializing(void) method. Second class inherits first class (BaseForm1). I used OnDraw() method to draw a background image.

But this error is shown:

./src/CreateForm1.o:(.data.rel.ro+0x4c): undefined reference to `CreateForm1::OnDraw()'
collect2: ld returned 1 exit status
clang++: error: linker (via gcc) command failed with exit code 1 (use -v to see    invocation)

This link is helpful, but my code is not working. Your valuable answers will be helpful.

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