I am using the slightly older version 13.2.20132.1011, but your sample works with that version also.

I suspect that the problem is related to the fact that Ctrl+A is also defined as a shortcut for the application's Ultra toolbar.

Past experience has shown me that the toolbar sometimes grabs shortcuts that I was not expecting it to grab.
On further examination I find that it is not only the combo box that exhibits this issue. All the other 'ultra' editors I use on my modal and modeless dialogs also ignore the Ctrl+A shortcut, even though their context menus 'Select All' items work.
(They don't just ignore the shortcut - the app 'beeps' when I type it.)

Strangely, Ctrl+C and Ctrl+V work fine for all controls - and those are also assigned to the toolbar.

mikedempsey said:

I suspect that the problem is related to the fact that Ctrl+A is also defined as a shortcut for the application's Ultra toolbar.

You suspicion is almost certainly correct. The Toolbar will handle the keystroke and thus it will never get to the control. I'm sure you will get the same behavior with any control, including the inbox TextBox control, as well.

If Ctrl+C and Ctrl+V work, then my guess is that your toolbar's ToolClick event is already handling those for the controls on the form.

But if we are showing a modal dialog surely the toolbar [on the parent form] should not be intercepting keystrokes that are destined for the child dialog.

(In the specic case I reported they were modeless dialogs so it might be more murky there, but the same thing is happening on my modal dialogs also.)

Am I missing something here?

Hello Mike,

I am just checking about the progress of this issue. Have you had the time to look into this. Let me know if you need my further assistance on this issue.

Thank you for using Infragistics Components.

Hi Mike,

Thank you for the update.

When you have the time, please upload the sample. I will be glad to look into it.

I am looking forward to your reply.

I created a simple test app but the problem does not occur.

I used an empty parent form and displayed one of the actual dialogs that fails, but it works fine when called from this empty parent.

So apparently it is caused by the parent form even though it still occurs when I don't pass the parent to the Show() or ShowDialog() method.

I don't have time to work on this at the moment but I may revisit it later. 

Hello Mike,

I am just checking about the progress of this issue. Let me know if you need my further assistance on this issue.

Thank you for using Infragistics Components.

Hi Mike,

Are you able to create a small sample project which reproduces the issue? We will be glad to research the sample and this way we can locate the issue a lot faster.

I am looking forward to your reply.