How to highlight 3D radio buttons item when mouse is over?

Hello,

I'm trying to highlight 3d menu compononets when mouse is over.

I got success with SoDialogPushButton with this code:

//after a SoRayPickAction
SoNode * pickedNode = pickedPath->getTail();

if (pickedNode->isOfType(SoDialogPushButton::getClassTypeId())){
	SoDialogPushButton * button = (SoDialogPushButton *)pickedNode;
	if (selectedDialogComponent!=button){
		unhighlightSelectedComponent();
		selectedDialogComponent=button;
		selectedDialogComponent->setPart(SbName("released"),highlightPushButtonPart);
	}
}
else
	unhighlightSelectedComponent();


void unhighlightSelectedComponent(){
	if (selectedDialogComponent==NULL)
		return;
	if(selectedDialogComponent->isOfType(SoDialogPushButton::getClassTypeId()))
		selectedDialogComponent->setPart(SbName("released"),unhighlightPushButtonPart);
	selectedDialogComponent=NULL;
}

//selectedDialogComponent is a global variable
SoDialogComponent *selectedDialogComponent;


But how can I highlight an item of radioButtons?? How can I know on
what item mouse is over and how can I highlight only that item?

Max