Problem with types

I have several iconbuttons and mist find the one with a certain tag. But when I want to work with it, I get
"java.lang.NullPointerException: Attempt to invoke virtual method 'android.view.ViewGroup$LayoutParams com.phillipcalvin.iconbutton.IconButton.getLayoutParams()' on a null object reference"

Why?

Code:

  Dim clickedbtn as IconButton
For Each v As View In Activity.GetAllViewsRecursive
Try
' only check iconbuttons
       If v Is IconButton Then
         t=v.Tag
Log...  

Problem with types

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