User controls and placeholder?

I have a webform where I use 50 different user controls. I have solved the problem with help from DANIEL (thanks again) by adding the user controls to a placeholder. But I have a problem:
How do I call functions in the the user controls? I receive an error saying:

Code:

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Object reference not set to an instance of an object

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Everything is working well when I just place the user control on the form, but that is not smart to do when I have 50 controls. So I have checked that there is nothing wrong with the code below as long as the user control is not placed in the placeholder.

What is wrong?

Code:

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Dim ctlCond1Abs As Control = LoadControl("Cond1Abs.ascx")
Dim ctlCond1Black As Control = LoadControl("Cond1Black.ascx")

Sub SetLanguage()
  Page.Controls.Add(ctlCond1Abs)
  plh1.Controls.Add(ctlCond1Abs)
  cond1Abs1.LangArray1 = clsLanguage1.getLanguage(session("language"))
  cond1abs1.setLanguage()
End Sub

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This is an example of a project with some simple code which illustrates my problem.

I think I just answered this but

you do a PlaceHolder.FinderControl(id) and cats that control to your user contral class and call the method