WPF DataGridTemplateColumn. Am I missing something?

Question

     
        
            
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Answer 1

The issue that you faced is that the control (e.g. TextBox) within the DataGridTemplateColumn is contained within a DataGridCell. By default the DataGridCell has tab-stop functionality. Thus the reason for having to hit TAB twice to get focus to your TextBox control. The solution is to disable the tab-stop functionality for the DataGridCell. This can be done via a style for the DataGridCell.

Here's the solution: