private void btnSelectChunks_Click(object sender, EventArgs e)
{
UpdateStatus("Expanding selection");
RegionUtil.SelectChunks(imgRegion.Layers[SELECTIONLAYER].Image, imgRegion.SelectionColor);
UpdateStatus("");
imgRegion.Redraw();
history.RecordSelectionState(imgRegion.Layers[SELECTIONLAYER].Image, "Select Chunks");
}