Key controls require prior mouse input

I have arrow keys and keycodes enabled for zooming.

<control keybaccelerate="0.1" keybspeed="10.0" keybfriction="0.9" keybfovchange="0.25" fovspeed="3.0" fovfriction="0.9" keycodesin="65,107" keycodesout="90,109" />

They work, but only after the user has somehow moved the panorama with the mouse.

Is it the expected behaviour? Or a problem of focus?

Thanks.

Just for reference: it is indeed a matter of focus. The focus on the pano object can be set via Javascript with:

document.getElementById("PanoObject").focus();

where PanoObject is the id passed to the embed function.