C# WPF ComboBox Mouse over color

Question

When the mouse hover over my ComboBox, I get an awful blue/lightblue pair of color for the backgroung of my ComboBox. I tried the solutions here :ComboBox Mouse over color,

Answer 1

Your problem arises from ButtonChrome in the ToggleButton's template. Remove it from the ToggleButton.

   ComboBox -> ToggleButton -> ButtonChrome 

Steps :

1) Open Expression Blend and edit a copy of ComboBox's Style , This will give you the Style of the ComboBox + it's Template and all it's TemplateParts , Among them is the problematic ToggleButton.

2) Locate the ToggleButton and it's Style called "ComboBoxReadonlyToggleButton" .

3) In "ComboBoxReadonlyToggleButton" replace the Themes:ButtonChrome with a Border (like shown in the 3'rd block of code below.)

The ComboBox's default template (Simplified !):

                                     
        
            .....
        
        
        
                         

The toggle button Style + Template (Simplified !).

What you need to do is to override the default ComboBox template and edit the toggle button's style by replacing ButtonChrome with a Border :