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Ok so you do have something that is movable: MY_GUI. The problem is that MY_GUI has no dimensions at all. I would give that dimensions first, and then give those same dimensions to the background. Both sets of dimensions would need to be changed if you add a new row, and want the window to become bigger. a Top Level Control is invisible by default, so if you change thebackground sizew without changing MY_GUI size then you will have some areas that have nothing but will move everything, or some areas of the background that can't be used to move it.
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