LyX ⇒ Sliding a Label

[ubugnu]

I want to slide a label so I use this TeX code.

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\xymatrix{A\ar^(.25){f}[r] & B}

Using directly this code as latex in LyX works, but I want to do the same thing in equations environment in LyX, what LyX is doing is putting all the (.25){f} part as superscript

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\xymatrix{A\ar^{(.25){f}}[r] & B}

How can I avoid this problem without having to write raw LaTeX in LyX?