Thank you for the attached code. I was able to run it right away and test easily.
It did not occur to me that you could be using the horizontal gauge, I assumed it was the Radial gauge at hand. The reason I assumed this, is that the radial gauge is little more needy when it comes to sizes, because it presently does not have a very refined logic for measuring and 'asking' for the right size.
I am attaching the results I get on my machine when I run the code, with one little adjustment - I put a BackgroundColor="Blue" for the two gauges so that you can see the space they occupy. I think that this is exactly what you were looking for. The gauge occupies the height you have in mind, but the indicator does not stretch. This is purely because the gauge elements do not stretch, but all of them (except for the needle in the radial gauge) have a defined size. The bar indicator has two properties that define its size - StartThickness and EndThickness. If you need the indicator to be larger, these are the properties you need to set.
It was an architectural decision that the gauge elements should be arranged with absolute units. This allows you to overlay indicators, and/or stack them, and/or choose arbitrary spacing between them. We think that this is more flexible as you have full pixel control.
I hope I was able to explain well that the gauge occupies the space you have chosen for it, but the indicator is smaller than this space. If you need further assistance I will ask that you provide us with more information on the output you are after, it will be very helpful if you send a drawing of some sort of how you need things to look.
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