Search Type: Posts; User: B.W.
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Add "indicator:false" to the loadmask config of the modal panel (removes the animation and also speeds everything up) and do the unmask onPainted listener. Inside lists will always show up.
I'm also getting this problem. Upgraded from Sencha Touch 1.0 to 2.1 and suddenly any modal Panel with a List on it gets blanked out (70% of the time). The whole app works flawlessly on Desktop...
You could try reloading the grid (easy for finite data) or set up a mechanism (cookie, array, Store field 'previousPosition', etc) that remembers where the fields were before the sort took place
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