How to set CTreeView properties

Hiya,
 Im trying to set my CTreeView control properties with the code:

SetWindowLongPtr( GetTreeCtrl().m_hWnd, GWL_STYLE, TVS_HASBUTTONS | TVS_CHECKBOXES );


However, it ends up crashing my program somewhere after the call. My CLeftView class owns the control and I tried calling it from the constuctor. Any help would be great.

Thanks,
  jer
pipeAsked:
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Vinayak KumbarSr Program ManagerCommented:
Hi,

Try using

long style = GetWindowLong(m_ctrlTree, GWL_STYLE);
SetWindowLong(m_ctrlTree, GWL_STYLE, style | TVS_HASBUTTONS | TVS_CHECKBOXES );

Here m_ctrlTree is the TreeControl object attached to the tree control.

Hope this helps.
VinExpert
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pipeAuthor Commented:
I see, you must retrieve the properties and append, not just add or append new properties.
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