Many controls (including infragistics controls) have SelStart and SelLength properties. What are they for the combo?
Hm, It doesn't seem to have them.
f the control is in edit mode, when you can do is get the ChildControls[0] - it will be a TextBox control, so you can use the SelectionStart and SelectionLength on that. But if the control is not in edit mode (does not have focus), there's no way to do it.
You might want to Submit an incident to Infragistics Developer Support. This might be an oversight.