c# NodeMouseOver Tooltip

I have the following code:

if (e.Node.Level == 2 && e.Node.Name.Contains("PI3K1003")) toolTip1.Show("test",_tv);

It works when I do hover the mouse over the appropriate node. However, when I leave the treeview control and then move the mouse back开发者_如何学运维 onto the control, the tooltip displays straight away, even though I am not hovering over this node?

Any ideas why?

Thanks.

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It is because you told the ToolTip control to show the tip for the entire TreeView, not just the node. Consider the TreeNode.ToolTipText property instead.