Currently we do not modify MinSize for grid children. When resizing a grid with buttons in it, the buttons will begin to clip when the space of the column span minus the left and right margins is less than the MinWidth of the button (which defaults to 75 pixels).
How to you think Cider should deal with MinWidth and MinHeight? In order to avoid clipping, we either need reduce the MinWidth or reduce margins and perhaps increase the ColumnSpan. This problem is complicated when multiple controls (grid children) are affected at once.