Hi Mike,

Thank you for the response and code.  More specifically, I have 4 combo controls.  I will refer to them as c1, c2, c3...  Some event sets c1's datasource = datatable.  The row selected event on all of the combos is set to load a datatable to the next combo in-line.  This code has been in Production for several months, again as a Visual Studio 2008 project and NetAdvantage 9.

Workflow:  User selects a value from c1 and a method is called from c1’s row selected event to set c2, c3 and c4’s datasource to null (to clear them) then c2’s datasource to a new datatable relevant to the value selected in C1.  User then selects a value from c2 and c2’s row selected event calls a method to set c3 and c4’s datasource to null, then c3’s datasource is set to a new datatable, etc.   The user can elect to have values selected in just c1 or all 4 combos.  It depends on the amount of filtering they want to set for an eventual button click to return data to a grid.

So it appears that the row selected event does not automatically fire when the combo's datasource is set in version 9, but now does in v 2011?  If this isn’t the case, I am willing to concede that I have no clue how to properly code this workflow.  Again, what I have has been working perfectly in the Visual Studio 2008 project with 9.2 controls.  I cannot get it to work the same in Visual Studio 2010 and 2011 controls.  My latest iteration is leaving each combo with the previously selected value regardless of what value they select.  It has been one of those weeks... :(

I am litterally a day away from having managment make the call to revert back to 9.2 - indefinitely.  This application was the test-bed for moving to 11.2 across all applications.  It has been a very trying upgrade experience.

Going to summarize one more time.  5 UltraCombos sitting in an UltraGroupBox.  The first is the driver, which contains a fixed set of values.  Only one of the values in Combo1 drives the visibility of the all 4 of the other Combos.  If this value is selected all 4 become visible and the Combo2's datasource is bound to a DataTable from a SQL query.  A selection from Combo2 drives another SQL query and the setting of Combo3's datasource.  If the query result contains only one record, a Combo3 perform action happens to select the first row.  This fires another query for Combo4.  This is working flawlessly in our application with version 9.2 of the controls, but I cannot reproduce this functionality after converting to 11.2.

The RowSelected events are firing multiple times and only the first value in Combo2 is being selected regarless of what is selected from its list.  The first row selected pass has the proper .text and value values, but the second firing of the event reverts to the first item in the control.

I am starting to think that because the first setting of Combo3's datasource from Combo2's RowSelected event has something to do with the behavior change from 9.2 to 11.2, because Combo3 and Combo4 events are firing before Combo2's RowSelected event can complete.  I am guessing that I need to leverage different events in a particular order to be able to reproduce the funtionality the users expect?

What is the last event to fire from an UltraCombo once someone selects (via a mouse click) a value from those that drop down? 

The last event to fire when a row is selected in the UltraCombo is the AfterCloseUp event.

Thank you Micheal S. and Mike S.

This post was elevated to a Support Case, so I now have examples from both of you.  This morning I was able to modify an example for another forum post of mine dealing with a single UltraCombo to reproduce that issue, which looks like the non-unique column I set as the Combo's .Value is causing that issue, which is not an issue with the current production application running 9.2.

I will work on one of your samples now to see if I can replicate this issue with the chained Combos.

Thanks again, Jaime

I was able to quickly reproduce the issue, which turn out to be the same issue just found this morning in my other post "Unexpected behavior changes between 9.2 and 11.2?". 

Michael S.  In your sample, simply change Combo2's .Value member to "State".  Because three of the records have "NJ" as their State, when Combo2 loses focus "Jersey City" is left in Combo2 as the selected record even if you select "Newark" or "Trenton".  This is the smoking gun and does not happen for us in our current production application using 9.2.  Changing the .Value and .DisplayMemeber to "City" is the equivalent of what I need to do to "fix" our upgraded 11.2 application.

I will update the case notes with these findings.  I do not know if it is appropriate to link case numbers in this forum for Mike S. to see, or would it be best for you to attach the sample from the case?

In the sample that you are referring to try setting the "ItemMatchingMode" property of ultraCombo2 to ValueListItemMatchingMode.DoNotConvertDataValueToString

Jaime,

Did you try my suggestion?