How to expand/collapse the tree-node from DevExpress XtraTreeList

You can expand or collapse the DevExpress XtraTreeList tree node programatically using the example below. You might want to do in the instance where you have a popup and you want the user to have the option to expand, collapse, expand all or collapse all the treenode list.

Expand the selected treenode list:

private void mnuItemExpandLibrary1_ItemClick(object sender, DevExpress.XtraBars.ItemClickEventArgs e)
{
    tlLibrary.FocusedNode.Expanded = true;
}
 
Expand All the child treenode list from the select parent node:
 
private void mnuItemExpandAllLibrary2_ItemClick(object sender, DevExpress.XtraBars.ItemClickEventArgs e)
{
    tlLibrary.FocusedNode.ExpandAll();
}
 
Collapse the selected treenode list:
 
private void mnuItemCollapseLibrary1_ItemClick(object sender, DevExpress.XtraBars.ItemClickEventArgs e)
{
    tlLibrary.FocusedNode.Expanded = false;
}      
 
Collapse all the treenode list:
 
private void mnuItemCollapseAllLibrary1_ItemClick(object sender, DevExpress.XtraBars.ItemClickEventArgs e)
{           
    tlLibrary.CollapseAll();
}

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