Trees, Lists and Check Boxes

[P-Cubed]

I'm looking for some assistance extending the TreeListCtrl class to
include the check box ability of the CustomTreeCtrl as well as 3-state
check boxes.

Main Column Column1
----------------------------------------- -------------
[o] Child1
|-----[ ]Child1.1
|-----[ ]Child1.2
|-----[o]Child1.3
|-----[ ]Child1.3.1 Value1
|-----[ ]Child1.3.2 Value2
|-----[ ]Child1.3.3 Value3
|-----[X]Child1.3.4 Value4
[o] Child2
|-----[ ]Child2.1
|-----[ ]Child2.2
|-----[ ]Child2.3
|-----[o]Child2.4
|-----[ ]Child2.4.1 Value1
|-----[X]Child2.4.2 Value2
|-----[ ]Child2.4.3 Value3
|-----[ ]Child2.4.4 Value4
[o] Child3
|-----[ ]Child3.1
|-----[ ]Child3.2
|-----[ ]Child3.3
|-----[ ]Child3.4
|-----[ ]Child3.4.1 Value1
|-----[ ]Child3.4.2 Value2
|-----[ ]Child3.4.3 Value3
|-----[ ]Child3.4.4 Value4

Any ideas on the easiest and most effective way to do this?