I have an Ext west panel from my viewport and I have a handler on a button that first removes all elements from west then ads another element, then does a doLayout(). So there are 3 things this function does on the click of the button. I would like to add a mask to the west panel when the button is clicked and unmask after all 3 tasks are completed. Here is the panel: { region: 'west', id: 'west-p
![ExtJS mask panel while actions are made](https://cdn-ak-scissors.b.st-hatena.com/image/square/98d6f053a97a87156775f60757c60865d0f2c47d/height=288;version=1;width=512/https%3A%2F%2Fcdn.sstatic.net%2FSites%2Fstackoverflow%2FImg%2Fapple-touch-icon%402.png%3Fv%3D73d79a89bded)