def initialize(options={})
      parse_options options
      yield self if block_given?
    end
Creates a new BookView object
@param [Hash] options  A hash of key/value pairs that will be mapped to this instances attributes.
@option [Symbol] visibility Specifies visible state of the workbook window. The default value for this attribute is :visible.
@option [Boolean] minimized Specifies a boolean value that indicates whether the workbook window is minimized.
@option [Boolean] show_horizontal_scroll Specifies a boolean value that indicates whether to display the horizontal scroll bar in the user interface.
@option [Boolean] show_vertical_scroll Specifies a boolean value that indicates whether to display the vertical scroll bar.
@option [Boolean] show_sheet_tabs Specifies a boolean value that indicates whether to display the sheet tabs in the user interface.
@option [Integer] tab_ratio Specifies ratio between the workbook tabs bar and the horizontal scroll bar.
@option [Integer] first_sheet Specifies the index to the first sheet in this book view.
@option [Integer] active_tab Specifies an unsignedInt that contains the index to the active sheet in this book view.
@option [Integer] x_window Specifies the X coordinate for the upper left corner of the workbook window. The unit of measurement for this value is twips.
@option [Integer] y_window Specifies the Y coordinate for the upper left corner of the workbook window. The unit of measurement for this value is twips.
@option [Integer] window_width Specifies the width of the workbook window. The unit of measurement for this value is twips.
@option [Integer] window_height Specifies the height of the workbook window. The unit of measurement for this value is twips.
@option [Boolean] auto_filter_date_grouping Specifies a boolean value that indicates whether to group dates when presenting the user with filtering options in the user interface.