Why I right click on a node in my treeview the focus moves to this node and then immediately back to the previously selected node. Is there some way that I can allow the right click to select the node?
That's because the highlight color performs two duties, it shows the selected node and shows the focused node. If you don't do anything with the right-click event then it jumps back to the selected node. The workaround is to select the node:
private void treeView1_NodeMouseClick(object sender, TreeNodeMouseClickEventArgs e) {
if (e.Button == MouseButtons.Right) treeView1.SelectedNode = e.Node;
}
Plus anything else you want to do, usually displaying a context menu.