adding controls thru code.

I am looking for a way to add controls (in this case a combobox or listbox) using code. I would like to add it in a way that it is embedded in a cell. I would like its value to be directly bound to the cell it is sitting in, as well as its attributes would tie it physically to the size and shape of the cell. Perhaps even restricting the column width or cell size to the width/size of the control. I hope this rambling makes sense. Any help or nudge in the right direction would be greatly appreciated!

TIA
J. Roberts