There are cases where the Quick Access Toolbar overflow button is disabled when it shouldn't be. This can result in two problems:
1. The "Customize Quick Access Toolbar" button is not accessible (even if all QAT buttons are disabled).
2. Enabled QAT buttons are not accessible.
This problem can be seen in the "Actipro Software WPF Studio - Sample Browser" (v12.2.0570 and v13.1.581.181), in the "Customizing the QAT" QuickStart. Steps to reproduce:
1. Add at least 10 enabled ribbon buttons to the QAT so that the overflow button will be displayed when reducing the width of the sample browser window (ie right click on ribbon buttons and select "Add to Quick Access Toolbar").
2. Add a disabled button to the end of the QAT (eg the Copy button).
3. Slowly reduce the width of the browser window until only the last button is hidden.
4. Hover over the overflow button (tooltip "More controls") and notice that it is disabled.
5. Slowly reduce the width of the browser further, and notice that the overflow button is still disabled even though some of the hidden buttons are enabled.