fheyn,
Let us assume you need to add a command button to the specific tab. In order to do it you may employ the following technique:
1. At design time, add invisible command1(0) command button as a first element of the array to that specific tab.
2. At run time, utilize this code:
Load Command1(1)
Command1(1).Visible = True
This tehcnique relies on control arrays. There is another technique available that relies on control collection.
Vladk