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I have a window in my application which is a CExtToolBoxWnd, and I want to load a tree control derived from CTreeCtrl on it.
I have a specific hirerchy in my tree structure and I want to retain the hirerchy.Kindly provide me some concrete way on it..

Will I be able to use features of ToolBox window like collapse and expand and highlight on mouse hover.?

Any sample application would of good help.

Sorry, forgot to provide a link to the sample. Here it is:

SDIDOCVIEW.zip

Here is a modified version of the SDIDOCVIEW sample in which there are two control bars: one with tree controls and another one with a toolbox. At the application initialization in the CMainFrame::OnCreate() method, we invoke a DuplicateTreeInToolbox() method which creates the toolbox items with the same hierarchy as in the tree control. This is done in the _WalkTreeChildBranch() recursive function.

It would be very helpful, if u can give us a sample

It seems you are asking about details specific to your project only. There is only one major difference between the CTreeCtrl and CExtToolBoxWnd controls: the former control has different nested levels of its items when the CExtToolBoxWnd control has a persistent 3-level item structure (invisible root item, group items and group member items). If you want put data of CTreeCtrl into CExtToolBoxWnd, then you should create a recursive function. If it is what you need, we can provide you with a sample. If not, we need more details about your task.