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I've created a column named as "work" which represents the time worked in a workday. Once it reaches the number 8(range field) the column "finish" increases one day and the column "duration" the same thing. I've been trying to find out the right answer, but no success. I just wanna know where to aim.
So, what is the issue - that nothing is rendered in your 'Work' column? Please provide the code you use to create your column. Also, please read docs for the Column class:
https://docs.sencha.com/extjs/4.2.2/#!/a ... umn.Column
https://docs.sencha.com/extjs/4.2.2/#!/a ... umn.Column