Hi,

The inbox Tooltips and the UltraToolTipManager component apply tooltips to a control. So since those buttons are not controls, you cannot apply a tooltip to them directly.

If you want to apply a tooltip to part of a control, then you can do this in a couple of ways. One way to is to change the control's tooltip based on the current position of the mouse. This can be a bit tricky, because you have to clear the tooltip when the mouse moves over some parts of the control and set it on others. There's a sample included with NetAdvantage under the WinMisc samples:

...\2009.2\Samples\WinMisc\CS\ToolTipManager\ToolTips with Context CS

This sample shows how to provide tooltips in different parts of the grid, so you could adapt it to work with UltraComboEditor for the buttons.

Another option would be to use a CreationFilter to apply tooltips to the EditorButtonUIElements directly.