DX8 windowed system

Hi guys, i''m using directx8. Some times ago I''ve coded a simple windowed framework using DirectDraw.I had a GraphicalObj class from which i derived a GraphicalEdit, GraphicalList, GraphicalComboBox etc... Each of these classes ridefined the abstract method paint(Canvas* canvas) and used my Canvas draw functions. If in a component i made a canvas->FillRect(0,0,GetWidth(), GetHeight(),0XFFFF00); (where getwidth and height returned the dimensions of the current control) i used the x-y origin of the control to offset any drawing so this call resolved to backBuffer->FillRect(GetXPos(),GetYPos(),GetXPos()+GetWidth() etc...) Now i wanted to make the same thing work in a 3d accelerated way with DirectX8.If i use the transformed and lit vertices i can have the same behaviour (i can specify the screen coords like i did with Blt in DirectDraw,ok). But i want to go a step further. How can I render a 3D object into one of those components? How can I offset the origin of 3D axis of the render target to match the x,y origin of the 2d GraphicalObject? I think I have to move the camera but i don''t know how. The major problem is clipping.How can I tell DirectX8 to set the clipper to a RECT of the current render target? The drawings inside each paint() redefinition have to be relative to the location of the rect of the GraphicalObj. I want to do like the menu in UnrealTournament. When you select a bot on the right there is the preview of the 3d Model that is perfectly clipped in the window where it is drawn. Any ideas?