A problem about a macros of setting trigger

I design a macro for setting trigger via applescript, but the problem is that after clicking adding a trigger, It waits several second before select "hot key trigger" I don't know whytrigger.kmmacros (2.4 KB)

tell application "System Events"
tell process "Keyboard Maestro"
	tell (first window whose subrole is "AXStandardWindow")
		tell group 1
			tell splitter group 1
				tell scroll area 3
					if button 4 exists then
						set focused of button 4 to true
						click button "New Trigger"
						click menu item "Hot Key Trigger" of menu 1
					end if
				end tell
			end tell
		end tell
	end tell
end tell

end tell