重载DrawItem 函数然后给出程序,为什么出不来按钮背景色呢?急!!!

在DrawItem里边写了这一段程序:
if(nIDCtl==IDC_BUTTON1)         //checking for the button 
    {
CDC dc;
RECT rect;
dc.Attach(lpDrawItemStruct ->hDC);   // Get the Button DC to CDC

rect = lpDrawItemStruct->rcItem;     //Store the Button rect to our local rect.

dc.Draw3dRect(&rect,RGB(255,255,255),RGB(0,0,0)); 
dc.FillSolidRect(&rect,RGB(100,100,255));//Here you can define the required color to appear on the Button.

UINT state=lpDrawItemStruct->itemState;  //This defines the state of the Push button either pressed or not. 

if((state & ODS_SELECTED))
{
dc.DrawEdge(&rect,EDGE_SUNKEN,BF_RECT);

}
else
{
dc.DrawEdge(&rect,EDGE_RAISED,BF_RECT);
}

dc.SetBkColor(RGB(255,100,255));   //Setting the Text Background color
dc.SetTextColor(RGB(255,0,0));     //Setting the Text Color


TCHAR buffer[MAX_PATH];           //To store the Caption of the button.
ZeroMemory(buffer,MAX_PATH );     //Intializing the buffer to zero
        ::GetWindowText(lpDrawItemStruct->hwndItem,buffer,MAX_PATH); //Get the Caption of Button Window 

dc.DrawText(buffer,&rect,DT_CENTER|DT_VCENTER|DT_SINGLELINE);//Redraw the  Caption of Button Window 

dc.Detach();  // Detach the Button DC
    }                
    CDialog::OnDrawItem(nIDCtl, lpDrawItemStruct);然后其它就没有设置了，是不是漏掉了什么了呢?