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ExpandableGroupBoxControlContainer cannot be removed from the UltraExpandableGroupBox's Controls collection
posted

I don't know what's causing this and I can't find anywhere where there's code trying to remove this control.

(1) System.ArgumentException: The ExpandableGroupBoxControlContainer cannot be removed from the UltraExpandableGroupBox's Controls collection.

(1) System.ArgumentException: The ExpandableGroupBoxControlContainer cannot be removed from the UltraExpandableGroupBox's Controls collection.


- Message --------------------------------------------
The ExpandableGroupBoxControlContainer cannot be removed from the UltraExpandableGroupBox's Controls collection.


- Stack Trace ----------------------------------------
at Infragistics.Win.Misc.ExpandableGroupBoxControlCollection.Remove(Control ctrl)
at System.Windows.Forms.Control.ControlCollection.Add(Control value)

<my code file>.InitializeComponent()