FIR High Pass Filter from Low Pass Filter Using Windows

How to implement a high pass filter similar to the code below using fvtool? I tried changing the impulse response of the LPF into HPF simply by using:

b = (-sin(wc*n))/(pi*n) instead of the LPF impulse response equation b = (sin(wc*n))/(pi*n). However, I got the same result as before which is the LPF result.

n = -25:25 %range
b = (sin(0.4*(n)))/(pi*n)%impulse response for LPF 
b = b.*bartlett(51)';%Window method
fvtool(b,1)