How to disable only one item checkbox from a tree list?

[Oliveira]

Hi folks!

There is a tree list and each item of this list has its own checkbox. I want to disable or dimmed some items checkboxes, but not all. I know the index of the checkboxes that I want to disable. How do I do it?

Regards.

Gustavo

[Oliveira]

    SetTreeItemAttribute(p_intDSPanelHandle, p_intDSControlID, g_intTreeIndex, ATTR_MARK_TYPE, VAL_MARK_NONE);