i want to remove the Event-Handlers from Sencha Touch, so that zooming in Mobile Safari works (Currently blocked by Sencha). Is there any solution for my Problem?
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Sencha touch relies on the viewport not being zoomable. The entire layout engine is based on the assumption that the viewport is the size of the screen. You can listen for your own pinch event and zoom some part of the UI that you choose to fix
Sencha Touch do not set scale and allow scrolling and resize on iPhone or iPad
http://www.sencha.com/forum/showthread.php?174008-How-to-Enable-Pinch-Zoom-to-HTML-content
http://www.sencha.com/forum/showthread.php?163059-Native-Zoom

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Ruan Mendes
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Maybe this will help:
http://docs.sencha.com/touch/2-0/#!/api/Ext.mixin.Observable-method-suspendEvents
http://docs.sencha.com/touch/2-0/#!/api/Ext.mixin.Observable-method-resumeEvents

Soenhay
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Those may help to suspend events, which supposedly is what the OP asked, but won't allow zooming with sencha – Ruan Mendes May 02 '12 at 15:44