Redraw window on OnPaint dont work!

[McGreg]

I have a dialogbased application, where i load trough the CPicture class an Image into a static field.
The picture is shown, thats the good part, but when i e.g. minimize and then open the window again, the picture isnt there.

i tried with

CShowPic::OnPaint()
{
CPaintDC DC(this);
CDC *pDC = new CClientDC( t );

CRect imagesize;
t->GetWindowRect(imagesize);
t->ScreenToClient(imagesize);

Picture.Show(pDC, imagesize ); // show the picture
Picture.FreePictureData();
UpdateData(FALSE);
delete pDC;
delete DC;
}

but no effect! did i forgot something?