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Adding Telerik Controls Dynamically into a Nested User Control

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uzairtahir
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uzairtahir asked on 29 Jan 2013, 10:07 AM

I am trying to add Telerik’s controls (like RadMaskedTextBox, RadNumericTextBox and RadDateInput controls) dynamically into a user control (under the Page_Init event) which is itself a child of another user control.

 

When I run the project, following exception occurred and nothing is shown in the user control.

“Microsoft JScript runtime error: Sys.ArgumentException: Value must not be null for Controls and Behaviors. Parameter name: element”

 

However, these controls are added directly on a .aspx page without any exception and it appeared that the Telerik’s controls get registered in the Page_PreRenderComplete event of an .aspx page and since this event does not exist in a user control therefore they are throwing the above exception.

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Andrey
Telerik team
answered on 01 Feb 2013, 07:59 AM
Hello,

Could you share your UserControl full source code? Thus all the people who want to help you will have better understanding of your project.

Regards,
Andrey
the Telerik team
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