public TreeContainerRow overDisclosureControl(int x, int y) {
		if (mShowDisclosureControls && !mColumns.isEmpty()) {
			if (x < mColumns.get(0).getWidth() + getColumnDividerWidth()) {
				TreeRow row = overRow(y);
				if (row instanceof TreeContainerRow) {
					int right = INDENT * row.getDepth();
					if (x <= right && x >= right - INDENT) {
						return (TreeContainerRow) row;
					}
				}
			}
		}
		return null;
	}