Thank you for using Syncfusion products.
We would like to let you know the reported requirement can be achieved by using the ButtonBackgroundSelected property in Office2013ColorTable. Please have the below code snippets to change the ButtonBackground color of the ToolStripTabItem when the mouse is hover on it.
//To Change color of the button back color during MouseHover
office2013ColorTable2.ButtonBackgroundSelected = Color.Red;
We have also prepared a sample for your reference and it is available in the following location. If we have misunderstood your query, please provide some additional details about your requirement, this will be helpful for us to analyze and provide you a prompt solution.
Sample Location : http://www.syncfusion.com/downloads/support/directtrac/136733/ToolStripButtonBackColor-112396983.zip
Please let us know if you need further assistance.