Qpainter function on a QFrame problem

[impeteperry]

Hi, I have

#ifndef MYCUSTOMFRAME_H
#define MYCUSTOMFRAME_H
 
#include "baseform.h"
#include <qframe.h>
#include <qpainter.h>
 
 
class MyCustomFrame : public QFrame
{
	Q_OBJECT
 
	protected:
		void paintEvent(QPaintEvent* event);
};
 
void MyCustomFrame::paintEvent(QPaintEvent* event)
{
		QPainter painter(this);
	painter.drawLine(0, 0, 200, 150);
}
 
#endif	// MYCUSTOMFRAME_H

#ifndef MYCUSTOMFRAME_H
#define MYCUSTOMFRAME_H

#include "baseform.h"
#include <qframe.h>
#include <qpainter.h>


class MyCustomFrame : public QFrame
{
	Q_OBJECT

	protected:
		void paintEvent(QPaintEvent* event);
};

void MyCustomFrame::paintEvent(QPaintEvent* event)
{
		QPainter painter(this);
	painter.drawLine(0, 0, 200, 150);
}

#endif	// MYCUSTOMFRAME_H

To copy to clipboard, switch view to plain text mode 

and it compiles with out errors or warnings.
I have 2 quentions:
1. How do I access it from the body of my program as I was required to remove "#include "mycustomframe.h" from "baseform.cpp"?

2. I have a class "drawingfunctions.h" where I would like to do the painting. If I read you correctly, I need to change the class name from

class DrawingFunctions : public QWidget
{
	Q_OBJECT
 
public:

class DrawingFunctions : public QWidget
{
	Q_OBJECT

public:

To copy to clipboard, switch view to plain text mode 

to

class DrawingFunctions : public QFrame
{
	Q_OBJECT
 
public:
	DrawingFunctions( QWidget *parent = 0 );

class DrawingFunctions : public QFrame
{
	Q_OBJECT

public:
	DrawingFunctions( QWidget *parent = 0 );

To copy to clipboard, switch view to plain text mode 

and i think the "parent = 0" is wrong.
And what do I need to change here?

DrawingFunctions::DrawingFunctions( QWidget *parent ) :  QWidget(parent)

DrawingFunctions::DrawingFunctions( QWidget *parent ) :  QWidget(parent)

To copy to clipboard, switch view to plain text mode 

As you can tell, i have no clear understanding of whats going on. I am able to use QTextEdit widgets on my base QFrame, but not the QPainter.
(These "uncontrolled" events of Qt4 are driving me up a wall.)

I really appreciate your patience with me.