according to ExtJS you can use rtl:true for mirroring right to left
does Ext.Net 2.1 support this ?
How to use this property with Ext.Net ?
UPDATE
As answered , it’s not yet supported but I found this css and js to be very useful
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This is first supported in ExtJS 4.2 and in none version before. I am not that familiar with Ext.Net but I doubt that it will be possible cause they are using the core too.