Hello,

I think there is a problem with grid columns (Ext.grid.column.Column) because once you set a dataIndex you cannot remove it, even if you change the type of the column to Ext.grid.column.Template. I have the following message : "This config value for dataIndex is mandatory"

ExtDesignerBug.jpg

I have this problem on version : 2.0.0 build 341

Regards