private void ReloadAcreBackground()
{
var tbuild = (byte)TR_BuildingTransparency.Value;
var tterrain = (byte) TR_Terrain.Value;
PB_Acre.BackgroundImage = View.GetBackgroundAcre(L_Coordinates.Font, tbuild, tterrain, SelectedBuildingIndex);
PB_Acre.Invalidate(); // background image reassigning to same img doesn't redraw; force it
}
