Button must be clicked once before it can be dragged in IE8

[John Ahlroos]

To drag a button you must first click once on it and then you can drag it.

[John Ahlroos]

Looks like the issue is on lines 254-260 in VButton:

     case Event.ONMOUSEMOVE:
            clickPending = false;
            if (isCapturing) {
                // Prevent dragging (on other browsers);
                DOM.eventPreventDefault(event);
            }
            break;

Since no move event is propagated down to the layout, the drag operation never starts. Curiously this has no effect when the button has keyboard focus and it only affects IE.