Let me put this with an example
Say we have an excel with some values, we are going to enter the values into the pqgrid from excel , say for example when I start entering a value into the third cell,in the middle of entry i need a clarification and pressing alt+tab to navigate to excel , and I checked the value and once I came back to the grid using alt + tab , the requirement we are asked for is that the cursor should be on the third cell with edit mode, there should not be any user click event on the cell , it should automatically go to the cell,
This is functionality which works in excel