subclassing QGraphicsItem, QGraphicsPixmapItem

[rogerholmes]

can someone point me in the right direction to find COMPLETE examples of subclassing. I have not made this request here because i did not want to look like an idiot... but i can not find the docs to show me how to do this.

this works for me
 
 QGraphicsItem *item;
item=this->scene()->addPixmap(pixmap);
 
i am trying to sub class QGraphicsItem.  
my subclass does not work :
myGraphicItem *item;
item=this->scene()->addPixmap(pixmap);
 
error !  cannot convert QGraphicsPixmapItem* to myGraphicsItem* in assignment.

this works for me

 QGraphicsItem *item;
item=this->scene()->addPixmap(pixmap);

i am trying to sub class QGraphicsItem.  
my subclass does not work :
myGraphicItem *item;
item=this->scene()->addPixmap(pixmap);

error !  cannot convert QGraphicsPixmapItem* to myGraphicsItem* in assignment.

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