def show_panel
      @tab_name = params[:panel_name]
      @panel_name = params[:panel_name] == "properties" ? "prop_sheet" : params[:panel_name]
      @all_pages = @question_sheet.pages.find(:all)  # for pages_list
      @page = @question_sheet.pages.find(params[:id])
      
      respond_to do |format|
        format.js # load panel
      end
    end
def show_panel
      @tab_name = params[:panel_name]
      @panel_name = params[:panel_name] == "properties" ? "prop_sheet" : params[:panel_name]
      @all_pages = @question_sheet.pages.find(:all)  # for pages_list
      @page = @question_sheet.pages.find(params[:id])
      
      respond_to do |format|
        format.js # load panel
      end
    end
load panel all AJAX-like
 GET