Modify Userform to highlight or unhighlight displayed ComboBox Value

I currently have a worksheet with two columns in it: Column A has file name and Column B has file path and name. These two columns are part of a named ranged called "Files", which I use as a "RowSource" for a ComboBox in a userform that displays these images in the userform.

What I am trying to do is use to command buttons that will either "highlight" or "unhighlight" the file name (column A) that is actively displayed in the ComboBox should the appropriate command button be activated (basically, perform a fill of yellow color if the "highlight" box is activated and remove all fills if unhighlight is activated). Any ideas how I would do so...

Attached is the workbook...the two command buttons do not have VBA assigned to them..Thx..

Book2.xlsm

Excellent.. I like the fact you were able to get it done with one button instead of two..Thanks.