How can I edit "d" to "c#" not "d flat" ?

I set D Major .
I set Two Pcs of Sharp .
if I played keyboard , cord of A (a , c# , e ), result is okey , no problem.
if I played keyboard , cord of D (a , d, f# ), result is okey , no problem.
But !
I have a problem when I point "d" by mouse , and I drag down mouse
(I just want Edit the tone of "d" , Down half tone , I want reset "d" to "c#")
the problem is c# is not shown , but "d flat " is appear.
How can I make "d" to "c#" ?