I have a ControlContainer with a rectangle in the foreground with a MouseUp event defined. I place a break point on the Call ItemClicked() line in the MouseUp event. When the webapp is run, the event does not fire. The ControlContainer itself contains no defined events. MouseUp is the only defined event on the rectangle.
Sub MouseUp(X As Integer, Y As Integer, Details As REALbasic.MouseEvent) Handles MouseUp Call ItemClicked() End Sub