void HidePlaceholder() { if (placeholder == null) { return; } placeholder.Destroy(); placeholder = null; placeholderArrow1.Destroy(); placeholderArrow1 = null; placeholderArrow2.Destroy(); placeholderArrow2 = null; if (dropRow != -1 && !dropNewRow) { RestoreShiftedBars(dropRow); dropRow = -1; } }