uid an extension übergeben

Hallo zusammen!

Kann mir jemand sagen wie ich an die extension die uid übergeben kann ... (Zeile 46)

lg
Marcus

lib.projectlist = COA
lib.projectlist {
	10 = HMENU
	10 {
		special = directory
		special.value = 32
		1 = TMENU
		1 {
		   expAll = 1
		}
		1.NO {
			doNotShowLink = 1
		        stdWrap.cObject = LOAD_REGISTER
		        stdWrap.cObject {
		        	site_uid.field = uid
		        	site_uid.dataWrap = |,{register:site_uid} 
		        	site_uid.dataWrap.insertData = 1        
      			}
		}
	}
	
	20 = CONTENT
	20 {
		table = pages
		select {
			pidInList.data = register:site_uid
		}
		stdWrap {
			wrap = <div>|</div>
			required = 1
		}
		
		renderObj = COA
		renderObj {
			
			30 = TEXT			
			30 {
				field = title
				typolink.parameter.field = uid
			        dataWrap = <div>|</div>
			}
			
			
			40 =< plugin.tx_flexformgetfield_pi1
			40 {
				uid = #hier muss die uid rein, mit uid gehts nich ...
				field = field_newsimage
			}
			
			50 = TEXT
			50.field = uid
		}

	}
}