One great new feature in Dynamics CRM 2013 is that certain fields are displayed as a composite control with a flyout to edit the individual parts of the composite field. This blog post on the Microsoft Dynamics CRM Blog gives details on how they work.
you need to find the controlid for the address 1 line 1 field inside of the flyout. The format for these controls appears to be "CONTROLNAME_compositionLinkControl_ATTRIBUTENAME" In this case, the composite control's id is "address1_composite" so the "address1_line1" control in the flyout's id is "address1_composite_compositionLinkControl_address1_line1" so you'd need to use
One easy way to access the flyout control without dealing with the cumbersome control id is to iterate through the controls of the attribute instead of going to the control directly using the id. This can also be handy when you have an attribute that is bound to several controls and you want to manipulate all of the controls for that attribute at once.