def initialize(options={})
      #defaults
      @active_pane = @state = @top_left_cell = nil
      @x_split = @y_split = 0
      parse_options options
    end
Creates a new {Pane} object
@option options [Symbol] active_pane Active Pane
@option options [Symbol] state Split State
@option options [Cell, String] top_left_cell Top Left Visible Cell
@option options [Integer] x_split Horizontal Split Position
@option options [Integer] y_split Vertical Split Position