If the grid is defined to increase downwards its origin has to be in the left upper corner (that's the case)
and this point has to have the the coordinates value 0 (that's not the case). Indeed the point reflects
the page length, (in my case 4548 pixels), which is wrong and turns out as a pain for Web work.

I want to define a grid which starts with an offset from the top (for my menu bar) and I at the same time
don't want to be determined in my page lenght. This currently unfortunately isn't possible

PS: The same error would occur if I for some reason wanted to have my X origin at the right hand side.
Any offset then had to apply to 0 at the right page margin but Xara still believes 0 is to the left.

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