Delphi XE5 FireMonkey TstringGrid cells don't accept keyboard input

I am using a TStringGrid which is placed on a popup (TPopup). when the user click a button the popup will appear with the stringGrid. user will then insert some data in the cells then clicking an apply button on the popup which will update a data array. the popup is used as a metro style flyout as per firemonkey sample.

the problem is that the string grid appears put when trying to edit a cell it doesn't accept any input from the key board.

Any idea how to solve this problem. I am using Delphi XE5.

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