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User Interface Programming: Using Tree Widgets |
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You can programmatically select or deselect nodes in a tree widget hierarchy using the SET_TREE_SELECT keyword to WIDGET_CONTROL. Selecting a node or nodes visually highlights the node on the tree display. In the above example, placing the following command just above the call to XMANAGER:
WIDGET_CONTROL, wtLeaf11, /SET_TREE_SELECT
would cause the first leaf node to be highlighted when the widget tree was first displayed.
IDL Online Help (March 06, 2007)