Forgot to size Grid and SimpleGrid's container properly. Fixed.

newctrl/grid.go

@@ -184,6 +184,8 @@ func (g *grid) mkgrid() (gg [][]int, colwidths []int, rowheights []int) {
 }
 
 func (g *grid) resize(x int, y int, width int, height int, d *sizing) {
+	g.container.resize(x, y, width, height, d)
+
 	if len(g.controls) == 0 {
 		// nothing to do
 		return

newctrl/simplegrid.go

@@ -118,6 +118,7 @@ func (g *simpleGrid) resize(x int, y int, width int, height int, d *sizing) {
 		return b
 	}
 
+	g.container.resize(x, y, width, height, d)
 	if len(g.controls) == 0 {
 		return
 	}