creating my own HtmlInputText

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I am adding some functionality to HtmlInputText so i derived my class from
it.
The problem is when i switch page to desing mode the VS shows an error and
do not render control.

Unable to cast object of type
'System.Web.UI.Design.HtmlIntrinsicControlDesigner' to type
'System.Web.UI.Design.ControlDesigner'

Not sure how to fix it and make it work in design time
Here is how my class looks like
public class GTextBox : System.Web.UI.HtmlControls.HtmlInputText

{

}

PS: It works fine in a runtime.

George.



.

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