windows 10 start menu not opening context menu not opening

WINDOWS 10 START MENU NOT OPENING CONTEXT MENU NOT OPENING CODE

You could either check ContextMenu for null, or use a flag in your code to check whether your handler has been run at least once. Right-click the rectangle above, context menu gets replacedĪssume that the initial ContextMenu value might be null, based on some preliminary logic. In this case, you can still use the handler shown in the previous example, but you typically want to assign a placeholder ContextMenu in the initial markup: Insure that ContextMenuOpening handlers always run against controls that have at least a placeholder ContextMenu available, which you intend to be replaced by the handler code. Also, if the user happens to right-click a second time, this time your new ContextMenu appears, the value is non null, and your handler will properly replace and display the menu when the handler runs a second time. But in this case, whatever new ContextMenu you set on the source element arrives too late to be displayed. When a user right-clicks a control, ContextMenuOpening is raised even if the existing ContextMenu is empty or null. However, if you use this style of handler for ContextMenuOpening, you can potentially expose a timing issue if the object where you are setting the ContextMenu does not have a preexisting context menu. void HandlerForCMO(object sender, ContextMenuEventArgs e) The code references a custom BuildMenu method, which is separated out because it is called by more than one of the example handlers. The following is the simple handler code for replacing a ContextMenu. But the more intuitive approach for replacing all items in the context menu is to create a new ContextMenu, populate it with items, and then set the FrameworkElement.ContextMenu property of a control to be the new ContextMenu. You could of course also use a variation of the preceding code, to remove every item of an existing context menu and add new ones starting with item zero. If ((String)mi.Header = 'Item4') return Īn alternative scenario is if you want to replace the entire context menu. check if Item4 is already there, this will probably run more than onceįrameworkElement fe = e.Source as FrameworkElement

void AddItemToCM(object sender, ContextMenuEventArgs e) You typically want to check the Items collection to see what context menu items already exist in the menu, and then add or remove appropriate new MenuItem items to or from the collection. The general technique is to get the source of the event, which is the specific control that was right-clicked, and get the ContextMenu property from it. You might do this in order to add or subtract context menu options in response to current state information in your application or particular state information that is available as a property on the object where the context menu is requested. Replacing the entire menu before display.Ĭompletely suppressing any existing context menu and displaying no context menu.Įxample Adjusting the Menu Items Before DisplayĪdjusting the existing menu items is fairly simple and is probably the most common scenario. There are several scenarios for handling the ContextMenuOpening event: This topic illustrates some of the code techniques for various context menu opening scenarios and illustrates a case where the timing issue comes into play. If you write handlers for the ContextMenuOpening event, you should be aware of timing issues between a ContextMenu control and the service that is responsible for opening and positioning context menus for controls in general.

The typical reason for setting Handled to true in the event data is to replace the menu entirely with a new ContextMenu object, which sometimes requires canceling the operation and starting a new open.

The ContextMenuOpening event can be handled in an application to either adjust an existing context menu prior to display or to suppress the menu that would otherwise be displayed by setting the Handled property to true in the event data.

Windows 10 start menu not opening context menu not opening