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X++ Working with Extended Forms

In the main model we have a Dialog form. I need to do a customization which adds fields to this Dialog form and return them to the main model. I have the new fields in an extension of the main model's Dialog form.

My question is: I have put an event handler on the OK button but I am unable to reference the object from the main model's OK script.

Below is the call to open the Dialog form. On the click of the Ok button I need the customization to update the overrideParameters object.

 Args args = new Args(formStr(TemplatesSelectionObject));
            args.parmObject(overrideParameters);
            FormRun formRun = classFactory.formRunClass(args);
            formRun.init();
            formRun.run();
            formRun.wait();
            formRun.detach();

The Ok button main model's click control:

 Args args = element.args();
 OverrideParametersClass overrideParameters = args.parmObject();
 
 // set the overrideParameters variable.

Customization has the event handler on the Ok button click. It's called but I was hoping / expecting to be able to do something like mainModelForm::overrideParameters.newAttribute = 'data';

Any suggestions or links will be greatly appreciated.

Thanks
Duane

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