I am fairly new to Ext JS, I have been messing around with it for a few months off and on and I have a design question. I have a viewport, the north panel is plain HTML, just a banner with the company logo. The west panel contains some links, basically a navigation bar. The center panel is where all the action will happen, grids, forms etc. Am I thinking correctly that when I load that app I will load all the center panels with only one of them visible? Then when a user clicks on a link in the west panel I will hide the currently visible panel and show the appropriate hidden panel? I appreciate the assistance, I am second guessing myself and I am not sure this is the best way.