Get Current Row Number Of A Drop Down Box

I have an application that when user insert a new row, it will place a dropdown box on first column of that row waiting user to make a selection to pupolate other attributes to the rest of columns of the row.

That runs fine if user follow the sequence precisely. That is, user create a row, make a selection, then create yet another new row, make a selection, and so on.

My trouble is that when user created a few rows consecutively without picking a selection from each dropdown first, but instead s/he first created a few rows (say on 21, 22, 23, 34, and 25) and then came back to make a selection from the dropdown box in row 21, the VB code would insist current working/active row number is 25, not 21. This becomes a big problem.

curRow = ActiveCell.Row
curRow = Selection.Row

both show curRow = 25, which are incorrect

Is there any mechanism that when user click on a dropdown, I will be able to get its correct position (row = 21, column = 1, for example) from the engaged dropdown box? In other programming languages "Me" is a reserved object that would give out individual's property, but I am not sure if that exists in Excel macro/VB.

I am new to Excel macro. I am looking for its answer for a few days and unfortunately I haven't found any clue yet.