checkedlistbox, help needed

Question

Hi, i've several prob/doubts abt CheckedListBox Control, 1), When i check(click on any value)- the checkbox which is inside the checkedlistbox is not toggling to checkedmode, but when i Double Click its working so, please tell me why?and suggest me the solution. 2)i've inserted(loaded) the values in to this checkedlistbox from an xml file, but now if i want to change the property of a perticuler node/childnode i couldn't able to do that, 3) please help me how to change the selected values [checked box values] i mean , when user checks the checkbox and clicks the update button, the respective property has to change to eidt="true" of my xml file.,PLEASE HELP ME I am using VS2005, for my c# windows applciation