[Value] DT_PREFIXONLY [Description] 
Draws only an underline at the position of the character following the prefix character &. Normally DrawThemeText interprets the & as a directive to underline the character that follows and the prefix characters && as a directive to print a single &. By specifying DT_PREFIXONLY, no characters are drawn, only an underline. White spaces are placed in the positions where characters would normally appear. For example: input string: "A&bc&&d" normal: "Abc&d DT_PREFIXONLY: " "