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Adding to Context menu problem with multiple RichTextBox instances

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Ralph
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Ralph asked on 22 May 2014, 09:11 PM
Our WPF application contains multiple RadRichTextBox instances. When right clicking in one of the instances I expected the ContextMenu_Showing event to get fired for only the RadRichTextBox control that I right clicked. This is not the case. 

The method gets fired for each instance of the RadRichTextBox.  As a result, instead of getting one "View Source" context menu item inserted into the context menu, I get one for each RadRichTextBox control.

I am trying to implement the modification of the RadRichTextBox's context menu as indicated at the following link:
http://www.telerik.com/help/wpf/radrichtextbox-features-context-menu.html

I also modified the example as indicated in the following blog to reference the correct ContextMenu:
http://blogs.telerik.com/xamlteam/posts/10-11-17/customizing-radrichtextbox-s-contextmenu-and-selectionminitoolbar.aspx

In the Telerik public constructor I have the following code:

            Telerik.Windows.Controls.RichTextBoxUI.ContextMenu contextMenu =
                (Telerik.Windows.Controls.RichTextBoxUI.ContextMenu)this.radRichTextBox.ContextMenu;
            contextMenu.Showing += this.ContextMenu_Showing;

I also have the following methods:

        private void ContextMenu_Showing(object sender, Telerik.Windows.Controls.RichTextBoxUI.Menus.ContextMenuEventArgs e)
        {
            RadMenuItem makeViewSourceMenuItem = new RadMenuItem()
            {
                Header = "View Source"
            };
            makeViewSourceMenuItem.Click += MakeViewSourceMenuItem_Click;
            ContextMenuGroup customContextMenuGroup = new ContextMenuGroup();
            customContextMenuGroup.Add(makeViewSourceMenuItem);
            e.ContextMenuGroupCollection.Add(customContextMenuGroup);
        }        private void MakeViewSourceMenuItem_Click(object sender, RadRoutedEventArgs e)
        {
            FrmHtmlSource dialog = new FrmHtmlSource(_originalText);
            dialog.ShowDialog();
        }

All the examples I have seen involve just one instance of the RadRichTextBox.  Is there anything special I need to do to support multiple instances or is this a limitation with the RadRichTextBox control.

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Boby
Telerik team
answered on 26 May 2014, 08:34 AM
Hi Ralph,
This is known peculiarity of the RadRichTextBox, caused by the fact that ContextMenu is instantiated by MEF, which by default caches the instance for reuse - meaning that all RadRichTextBox instances use one and the same context menu.

As a workaround, I would suggest you to try one of the two approaches explained in this forum thread.

Don't hesitate to contact us if you have other questions.


Regards,
Boby
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Ralph
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answered on 27 May 2014, 09:28 PM
Thanks Boby,  you suggestion fixed the problem.
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