In a drawing with several layer and group filters and xrefs, I would find it very handy to be able to select which layers of the filter, xref, or All from a Layer Control button on the Layers toolbar I want to see in the Layer Control window. I often pick the Layer Contol only to find it lists the layers of the last filter I accessed in Layer Properties Manager. Then I have to open LPM, select the filter, and later it is the same all over again.