rendering to texture is clipped to clientsize inwindowed mode?

I posted this already in the W32 Graphics discussion section, but since I am pretty hard pressed with the problem I am also posting it here:

I wrote a small application using managed DX9 in an application running in
windowed mode. The clientsize of the window is 800x600. In this application
text (and sprites) are rendered to a 1024x512 pixel texture. The viewport
settings seem to be correct after the SetRenderTarget call (1024x512), and I activated no clipping whatsoever, but the text and sprites drawn to the texture still
are clipped to the size of the client area of the windows form and I cannot
find any reference to such a clipping in the documentation or in tutorials.
The only method that seems to "see" the whole texture is the device.clear call. I checked the device settings while debugging the application, but I could not find any hint to why the output on the texture is clipped to 800x600.
Is this somehow connected to the size of the back buffer (There is no back buffer in a windowed application as far as I know.) If this is so: Is
is possible to change the size of the back buffer in a windowed mode
application

Any help or hint is being appreciated.

Thanks a lot

Stephan

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rendering to texture is clipped to clientsize inwindowed mode?

Alan Grosz
Replying to Myself: The z-buffer seems to interfere even with 2d operations. Disabling the z-Buffer removed the clipping effect.

Thanks for reading.

Best regards
rendering to texture is clipped to clientsize inwindowed mode?

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