UI Scripting custom Open/Save dialogs

I’m updating a script I used with Adobe Photoshop Elements. In Elements’ save dialog there are controls for file format etc. Under Jaguar, the below script worked to select “Pict File” from the format menu and then save. Under Panther it can’t find the popup menu, and the UI Inspector shows it as being a child of “AXUnknown”. Any ideas how I can get around this?

Thanks!


try
	--Bring Photoshop to the front
	tell application "Photoshop Elements 2.0" to activate
	
	tell application "System Events"
		
		--Save the file
		click menu item "Save As..." of menu "File" of menu bar 1 of process "Photoshop Elements 2.0"
		delay 1
		tell process "Photoshop Elements 2.0"
			tell window "Save As"
				-- This is the line that breaks in Panther:
				tell pop up button 1
					click
					delay 1
					tell menu 1
						click menu item "PICT File"
					end tell
				end tell
				keystroke return
			end tell
			delay 1
			keystroke return
		end tell
	end tell
	
	return true
on error error_message
	display dialog error_message
end try