Sets a value controlling how the color is applied. When undefined (the default), the theme controls the default fill mode. Can also be set to the following string values:

• "solid"
• "flat"
• "outline"

The "none" value is deprecated. Use custom CSS instead.

Example - sets the fillMode

<select id="dropdown">
    <option>Item1</option>
    <option>Item2</option>
</select>
<script>
  $("#dropdown").kendoDropDownList({
    filter: "contains",
    fillMode: "flat"
  });
</script>