The Else clause on PBEmpty is only executed when the program starts up, mainly to prevent the other code from executing the first time.
When a new PictureBoxClass instance is created, it's saved in the array and then all of the properties, including the two new ones added to the inherited PictureBox class, are set. Then FlipPB is added as a Handler for the current element of the PB array - an instance of the class - and it's added to the controls collection of Me - which is Form1.
Here's the routine to delete.
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Private Sub RemoveFromPB()
If PB.Length > 0 Then
Dim a As Integer = PB.Length - 1
Dim temp(a) As PictureBoxClass
PB.CopyTo(temp, 0)
ReDim PB(a - 1)
temp.Copy(temp, PB, a)
Me.Controls.Remove(temp(a))
temp(a).Dispose()
End If
End Sub
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