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submitting a ...**  (check one with \"x\")\r\n```\r\n[x] bug report => Search github for a similar issue or PR before submitting\r\n[ ] feature request => Please check if request is not on the roadmap already https://github.com/primefaces/primeng/wiki/Roadmap\r\n[ ] support request => Please do not submit support request here, instead see http://forum.primefaces.org/viewforum.php?f=35\r\n```\r\n\r\n**Plunkr Case (Bug Reports)**\r\nhttp://plnkr.co/edit/YvhroNjH0A9WkZUMy4kc?p=preview\r\n\r\n**Current behavior**\r\nThrows find of undefined error when rows are grouped by rowspan.\r\n\r\nTaking a look at the source code of datatable.ts, seemed to be initializing the columns in ngAfterContentInit. But, 'this.columns.find' is executed in ngDoCheck, the step before the content is initialized. \r\n\r\n**Expected behavior**\r\nRows must be grouped on groupField\r\n\r\n**Minimal reproduction of the problem with instructions**\r\n\r\nhttp://plnkr.co/edit/YvhroNjH0A9WkZUMy4kc?p=preview\r\n\r\nwhen groupField, sortField and rowGroupMode are passed to p-dataTable, the entire table breaks. It throws 'Cannot read property 'find' of undefined' in the console.\r\n\r\n \r\n**What is the motivation / use case for changing the behavior?**\r\nRow Grouping on the Table\r\n\r\n**Please tell us about your environment:**\r\n Win 10, VS2015, NPM, Asp.Net Core RTM\r\n\r\n* **Angular version:** 2.0.0\r\n\r\n* **PrimeNG version:** 1.1.1/1.1.4\r\n\r\n* **Browser:** Chrome, Firefox, Edge\r\n \r\n* **Language:** TypeScript 2.0\r\n\r\n* **Node (for AoT issues):** `node --version` =   v4.2.5\r\n"}}
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