child size needs to be updated post render to ensure we have accurate calculation, controlsPerPage calculation needs to adjust to ensure a fixed amount of overage for scrolling compensation

Enyo-DCO-1.1-Signed-Off-By: Cole Davis (cole.davis@lge.com)
allowing the events to propagate for relayout/reflow when a control isn’t showing causes calculation issues unnecessarily

Enyo-DCO-1.1-Signed-Off-By: Cole Davis (cole.davis@lge.com)