private void PreTarget(Size availableSize)
{
// Need to allocate space to Star columns
if (_columnStars > 0.0)
PreTargetStarDefinitions(availableSize.Width, _proxyColumns, _columnStars);
// Need to allocate space to Star rows
if (_rowStars > 0.0)
PreTargetStarDefinitions(availableSize.Height, _proxyRows, _rowStars);
// Need to recalculate the offsets for each column
CalculateOffsetsAndTotals();
}