casting custom classes

[Sam]

Namespace system.web.ui
Public Class ReplacableControlCollection
Inherits ControlCollection
End Class
End Namespace
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Public Shadows ReadOnly Property controls() As
ReplacableControlCollection
Get
Return MyBase.Controls
End Get
End Property
-------------------------------------------------------

Error:
System.InvalidCastException: Unable to cast object of type
'System.Web.UI.ControlCollection' to type
'System.Web.UI.ReplacableControlCollection'.
Line 60: Return MyBase.Controls

-------------------------------------------------------

how do i cast this?
the only thing difference in ReplacableControlCollection from the
original ControlCollection is an added sub "replace()".

Sam.

 

[sam]

whoah dude,

You are trying to cast *down* the inheritence chain. You can't do that