DrawPrimitve

I can clear see the triangles in my object when I render! How can I fix this problem? Here is little more info: * Object is a self made, very simple, stair with 8 steps. Every step have 4 triangels (2 for front-quad and 2 for the top-quad). * I use 1 point ligtht, that moves with the camera. * I store the object in a vertexbuffer, transform the WORLD matrix and render the object with DrawPrimitive D3DPT_TRIANGLELIST. I render 2 primitives at once (render 2 primitives, switch texture and render 2 more). The strange thing is If I render a object with more then 2 triangels in one call, like this, device->DrawPrimitive( D3DPT_TRIANGLELIST, 0, all ); the 2 triangles that made up a quad dosen´t be visible. But If I draw the object with many calls with diffrent start index, like this: for(int i=0; iDrawPrimitive( D3DPT_TRIANGLELIST, 6*i, 2 ); the quads 2 triangels is visible! Zeblar Nagrim, Lord of Chaos