Option to change tab color

examples/example.rb

@@ -51,6 +51,7 @@
 examples << :cached_formula
 examples << :page_breaks
 examples << :rich_text
+examples << :tab_color
 
 p = Axlsx::Package.new
 wb = p.workbook
@@ -843,3 +844,14 @@
   p.serialize 'rich_text.xlsx'
 end
 #```
+
+##Change tab color of sheet
+
+#```ruby
+if examples.include? :tab_color
+  wb.add_worksheet(:name => "Change Tab Color") do |sheet|
+    sheet.add_row ["Check", "out", "the", "Tab Color", "below!"]
+    sheet.sheet_pr.tab_color = "FFFF6666"
+  end
+end
+##```

lib/axlsx/workbook/worksheet/sheet_pr.rb

@@ -40,12 +40,17 @@ def initialize(worksheet, options={})
     # @return [Worksheet]
     attr_reader :worksheet
 
+    # The tab color of the sheet.
+    # @return [Color]
+    attr_reader :tab_color
+
     # Serialize the object
     # @param [String] str serialized output will be appended to this object if provided.
     # @return [String]
     def to_xml_string(str = '')
       update_properties
       str << "<sheetPr #{serialized_attributes}>"
+      tab_color.to_xml_string(str, 'tabColor') if tab_color
       page_setup_pr.to_xml_string(str)
       str << "</sheetPr>"
     end
@@ -56,6 +61,11 @@ def page_setup_pr
       @page_setup_pr ||= PageSetUpPr.new
     end
 
+    # @see tab_color
+    def tab_color=(v)
+      @tab_color ||= Color.new(:rgb => v)
+    end
+
     private
 
     def update_properties