You need to use this class AdvancedComboBox : ComboBox instead of your ComboBox Control. This method is called "Subclassing" and you can take a look how to do it:
Quote:
How to subclass windows in Windows Forms by using Visual Basic .NET
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I would rather simply use a place holder in the WinForm and create a control in the source code like this:
Dim oCmbBox As AdvancedComboBox = New AdvancedComboBox()
Then you can move it on the right place using the coordinates of the place holder ...