RibbonBar Event for Menu Item Clicked

We have several ribbonbars throughout our application, all been working fine until we installed 3.1.8 of WiseJ (to fix a bug in the DataGridView ColumnWidthChanged event). We can no longer click on any dropdown in the RibbonBar (ie. a button with menu items).

I’ve attached a sample project to demonstrate this. This has a RibbonBar with one button, with a few menuitems. If you click the button to drop the items down, then click any of the items – it errors.