RViz and interactive markers: Why does not pose automatically updated?

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Hi all,

When an interactive marker's pose is changed using a control (for instance the 6-DoF control provided in basic_controls), why does the field int_marker.pose is not filled why the new value automatically?

I spent a long time debugging my node when I realized that I had to update it myself with such a callback function for instance:

void processFeedback(const visualization_msgs::InteractiveMarkerFeedbackConstPtr &feedback)
{
switch (feedback->event_type) {
    case visualization_msgs::InteractiveMarkerFeedback::POSE_UPDATE:
        int_marker.pose = feedback->pose; // MANDATORY??
        server->insert(int_marker, &processFeedback);
        server->applyChanges();
        break;
}

Even if the pose is not updated, the display is correct and my object moves when I control it with the interactive marker, so where are stored its coordinates?

Many thanks