In C++ Builder: How can I accept amounts in a control or cell?

I want a cell in a grid or an edit control to accept real numbers like -543.674, 0.024, 156743.001, -3.142, but I don't find a direct way to do it. I've tried masks like ######0.000 or #9999.999 but they work funny. Masks seem suitable for phone numbers, area codes, but not for money amounts or other quantities... weird!!! Thank you for your help...In C++ Builder: How can I accept amounts in a control or cell?
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You want to make sure that input is set to decimal/double.