I'm trying to move a command button to the buttom of a form, but sounds like I'm having a problem

btnAdd.Location = New Drawing.Point(360, Me.Height - btnAdd.Height)

This way the button will be outside the form, but if I use this code instead, it will work
btnAdd.Location = New Drawing.Point(360, Me.Height - btnAdd.Height - 30)


Why do I have to subtract 30 pixels? is that for the titlebar perhaps?