How can I programatically cause a control\'s tooltip to show in a Winforms app without needing the mouse to hover over the control? (P/Invoke is ok if necessary).
If you are using the Tooltip control on the form, you can do it like this:
Tooltip
ToolTip1.Show("Text to display", Control)
The MSDN documentation for the ToolTip control's "Show" method has all the different variations on this and how to use them.