convert hex number to decimal in gcalc on OpenIndiana

Today I had to convert the a hex number to the decimal number.

As usual I thought to use the gcalc ( Gnome Calculator ) but on
OpenIndiana 151a5 there are no radio buttons to switch between bases.

In the "Programming Mode" are to buttons for base16, base8  and base2, but
how to convert

Just enter the hex number, press the X16 button or <Ctrl-H> and just
press <Enter>  again.
This does the conversion.