In general when you disable a button the image that you see (the x sign) is the default one. However, you could change it to any other by simply using the DisabledImageUrl
property. Since the RadRibbonBar is relatively new control there are still features that are not implemented yet and disabling a RibbonBarTab is one of them. I already logged that for future implementation and our development team will do their best to implement it for the Q3 release of the controls.
Considering your first question: Buttonclick event fires, but this time RibbonBarButtonClickEventArgs is set to nothing, and the code dumps out as we try and determine which button was fired
Can you provide more details on how we could reproduce the issue? For example some code snippet of how you determine which button is clicked? Since you can not attach files to forum posts you could also open a support ticket and send us a simplified runnable project where we can inspect the issue locally and come back to you with a suitable solution.
the Telerik team
Thank you for being the most amazing .NET community! Your unfailing support is what helps us charge forward!
We'd appreciate your vote for Telerik in this year's DevProConnections Awards. We are competing in mind-blowing 20 categories and every vote counts! VOTE for Telerik NOW >>