OptionMenuGrp keyboard navigation?

Just doing some testing and I noticed that tab to an OptionMenu in (my Maya) and using arrow keys to change the value doesn’t work as I would expect in any app. It does focus but won’t cycle with the keyboard.

I unmapped my arrow keys in case there was a global hotkey overriding.
Would anybody mind checking this code from help and see if it’s just me.
Tab between the 2 menu items and see if you can change values with arrow keys.

Thank you.
A

string $window = `window -title "Example 1"`;
columnLayout;

//    Create a couple of option menu groups.
//
string $colors = `optionMenuGrp -label "Colors"`;
menuItem -label "Red";
menuItem -label "Green";
optionMenuGrp -l "Position";
menuItem -label "Left";
menuItem -label "Center";
menuItem -label "Right";

//    Now add an additional item to the first option menu.
//
menuItem -parent ($colors + "|OptionMenu") -label "Blue";
showWindow $window;