Hi Stefan,

Thanks for your reply...

When I was using Infragistics 2011 version, there used to be "InfragisticsSL4.Controls.Editors.v11.2" dll reference in my project. Now, in 2012 vol 2, I could not find that dll to refer to. Could you please guide me on this? I don't know if that has caused any problem or not, I'm simply trying to find out the possibility...

Thanks and Regards,

Rohan

Hi,

I couldn't find anything wrong with your code that would cause the exception. I tried it locally with build 12.2.1001 and it works fine for me.

I couldn't find a tool with matching ID for one of the QatPlaceholderTools that you have in your QAT (the one with TargetId="Help"), but that shouldn't be an issue.

Looking at the exception, off the top of my head, here are the situations which could lead to it that I can think of:

    1. If you're using customized template for the XamRibbon. Since 12.1 we added a Ribbon Customization feature, if you don't have a Customization Dialog in your template, then you might end-up facing such an exception. You can check if that's the issue by checking if ribbon.XamRibbonCustomizationDialog property is null.

    2. If you're creating a QuickAccessToolbar object somewhere outside a XamRibbon control (e.g. in UserControl.Resources).

Could you check if that's the case?

Hope this helps,

Hi Georgi,

Thanks for spending time on my problem and your efforts.

Even I've tried to copy the given snippet in some sample application which does not give any exception. I've also set the customization dialog propety to null in xaml but that didn't help me; the exception still occurs.

But, as you have specified in 2nd case, our code is playing with QuickAccessToolbar and Ribbom objects in C# code.

e.g. 1. changing visibility of entire XamRibbon to false before user login, and making it visible if user logs in successfully;

       2. changing ribbon's caption after login;

       3. statements like : ribbon.QuickAccessToolbar.Tools.Clear(); OR ribbon.QuickAccessToolbar.Tools.Add(tool); where tool is QatPlaceholderTool object.

So, this way, we are modifying quick access toolbar dynamically in code behind. Do you think this is causing any problem? And yes, this is all being done in the same user control where Ribbon control is placed in.

Thanks and Regards,

Rohan

Hi Rohan,

rohanb said:

I've also set the customization dialog propety to null in xaml but that didn't help me; the exception still occurs.

It should not be null. If it's null - you'll get the exception. This is why I asked if you use customized template (or a theme) for the Ribbon - if you don't have the Customization Dialog as a template part, it will be null and you'll get the exception.

As for the modifications you're doing in code behind - that shouldn't be an issue.

The Null Ref Exception thrown in the Loaded event of the QuickAccessToolbar suggests that either the QuickAccessToolbar is not attached to a parent XamRibbon control in the moment it's being loaded in the UI, or the CustomizationDialog property for this Ribbon is null.

Regards,

Hi Georgei,

Thanks a lot my friend.... You have solved my problem....Many many thanks....

I have now used customization dialog template in my code now and it is NOT giving me the exception.... :) I copied one style from infragisitc's sample source code for RibbonCustomizationDialogWindow to my code and it worked like a charm... ;)

By the way, I am wondering, if it is mandatory to set that property, is there any place where Infragistics talks about it? I mean, how would I know all such properties which Infragistics expects to be "NOT NULL"?

Once again thanks...

Thanks & Regards,

Rohan