AX / Dynamics 365 For Finance and Operations blog

It’s easy, you must use this.formRun().design().controlName() syntax like shown below

[ExtensionOf(formDataSourceStr(SalesTableListPage,SalesTable))]

final class SalesTable_SalesTable_Extension

{
public int active()

    {

        int ret;

  

        ret = next active();

        

        SalesTable salesTable = this.cursor();

       

	FormButtonGroupControl invoiceBtn = this.formrun().design().controlName(formControlStr(SalesTableListPage, buttonName)) as FormButtonGroupControl;

        

        invoiceBtn.enabled(false);

		



        return ret;

    }
}