The position of a layout group changes, when first hidden and then shown by setting the Visibility on the layoutgroup to Never and then Always. See the flash demo attached.
Steps to Reproduce:
Try the solution attached, and press the button multiple times.
Expected Results:
The grid and the splitterbar is hidden, when the button is pressed. When the button is pressed again, the grid and splitterbar are shown again at there original position.
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Thank you very much for the report. It seems to be a bug with our controls. We'll research this problem further and try to resolve it as soon as possible.