Two formatting Questions

Hi Guys

I have 2 questions related to formatting of TextBoxes

1. I have a ComboBox26 that contains Yes & No and if Yes is chosen then TextBox8 needs to turn Yellow to indicate a required entry otherwise it should stay White
The code I am using is:

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2. I have a ComboBox27 that contains Yes & No and if Yes is chosen then TextBox9 & TextBox10 need to turn Yellow to indicate a required entry otherwise it should stay White
The code I am using is:

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Neither of these work even if I add the "" around the Yes or No

Any help please??

Derek