Question: How apply typesetting for variables that depend of more then 1 independent variables?

Hello, i wish to get dot displayed for time derivative and prime displayed for space derivative. I put typesetting in extended mode but it seems to only work for variable that depend only of time. So how can i get (in 2D math) dot displayed for derivative in time and prime displayed for space? 

Example u(x,t):

diff(u(x,t),x) --->  u'(x,t) output displayed in prime

diff(u(x,t),t)  --->  u^. (x,t) output displayed in dot


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