Actions can only set some properties for 1 control

When I try to change the caption of a X number of controls, I seem to fail using actions

This is a simple test demonstrating my problem:

Const ID_TEST = 100     cb.EnableActions     cb.ActiveMenuBar.Controls.Add xtpControlButton, ID_TEST, "Test1"     cb.ActiveMenuBar.Controls.Add xtpControlButton, ID_TEST, "Test2"     cb.Actions.Add ID_TEST, "", "", "", ""     cb.Actions(ID_TEST).Caption = "Changed"     cb.Actions(ID_TEST).Enabled = False

This code only changes the caption of 1 control, but it DOES change things like enabled state and visibility.
Perhaps I'm missing something, but why do some properties work and others don't?