Check / Uncheck A TreeView Item When Clicking The Label,if all children is checked the parent checkBox is checked

[yyy111]

Now I have a TabStrip,this TabStrip has tow items,in first item,there is a tree view,how could i check  or uncheck the TreeView Item When Clicking the Label,and if all children is checked  the parent checkBox  is checked 

[yyy111]

I have get a current reply,thanks