internal override void Reflow()
{
SetupSplitter();
for (int k = 0; k < children.Length - 1; k++)
{
splitState.DoSplitter(k, k + 1, 0);
}
splitState.RelativeToRealSizes(vertical ? (int)position.height : (int)position.width);
SetupRectsFromSplitter();
}