Cannot find AjaxResult in Dynamic Control Creation

Hello,
I am trying to implement adding controls from a controller action similar to https://forums.ext.net/showthread.ph...oller-function The previous example uses

Code:

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return new AjaxResult ( script )

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, but I cannot seem to find where the

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AjaxResult

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class is defined. I am currently using

Code:

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return this.Direct ( script )

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The call succeeds, but no control is added to my panel. Which library contains

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AjaxResult

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My

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success

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function in javascript receives the following result

Code:

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Ext.getCmp("DesignerDrawPanel").add({xtype:"textfield",x:567,y:270,fieldLabel:"New TextField",value:"Testing"});

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Do i need to add this to my page somehow in the javascript

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success

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function? I have added it to my page using

Code:

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eval(result);

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...is that how it is supposed to work?
Thank you.