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In UserControl, FooCmdCanExecute (context menu) not called until after a control button is clicked.

Posted By:      Posted Date: September 29, 2010    Points: 0   Category :WPF

I'm seeing an odd behavior I can't explain.  I am using a 3rd party control, and while it's possible it's an issue with that control, I wanted to inquire here to see if anyone has experienced similar behavior in other instances (unrelated to my particular 3rd party control).

I created a UserControl, comprising a ComponentONE chart and several buttons.  When the UserControl is given a data source (for the chart), it programmatically creates a ContextMenu that allows the user to configure the Y view extent for each of the data series provided in the data source.  After it's created, it's set as the ContextMenu for the chart.  The UserControl is used inside a tab on the app's main window, and is also plunked directly inside another window that can be brought up.

The UserControl defines a RoutedCommand - let's say FooCmd.  When the MenuItems for the context menu are created, their Command properties are set to FooCmd.  Also, a CommandBinding in the UserControl associates FooCmdCanExecute() and FooCmdExecuted() in the control class with the command.

The buttons in the UserControl are for data navigation - e.g. , there's one that moves the chart's "viewport" to the beginning of the data, and one for the "end".  The click handlers are not complex - essentially, they just set

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Although the context menu is a common element of most desktop applications, it is still fairly uncommon in Web application names because it doesn't map well to a server-based technology like ASP. NET.

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