Problem with ContextMenuOpening

[Hilda Kenny]

hi,
I have a radcontextmenu which only seems to work once. When I right click, my new items are added to the default menu, but when I go to do it again, I get the error message: 'Cannot remove the specified item because it was not found in the specified collection.'

here is the code:

 

Private

 

Sub grdSearch_ContextMenuOpening(ByVal sender As Object, ByVal e As Telerik.WinControls.UI.ContextMenuOpeningEventArgs) Handles grdSearch.ContextMenuOpening

 

 

Try

 

 

 

 

e.ContextMenu.Items.AddRange(rcmDebts.Items)

 

Catch ex As Exception

 

MsgBox(ex.Message)

 

End Try

 

 

 

 

 

End Sub

 

[Jack]

Hello Hilda Kenny,

The context menu is generated every time when it is being shown. So, you have to add your items every time when handling the ContextMenuOpening event. Find more information about RadGridView context menus in this help article.

I hope this helps.

Regards,
Jack
the Telerik team

[Hilda Kenny]

That's what I am currently doing, if you see the code above

[Richard Slade]

Hi Hilda, 

Where are the rcmDebts.Items coming from? See example below where the item is created each time the context menu item opens. 

Private Sub GridView_ContextMenuOpening(ByVal sender As System.Object, _
    ByVal e As ContextMenuOpeningEventArgs) Handles GridView.ContextMenuOpening

    If TypeOf e.ContextMenuProvider Is Telerik.WinControls.UI.GridDataCellElement _
    AndAlso GridView.SelectedRows.Count > 0 Then

        ' Clear any current items if you don't want the default menu
        e.ContextMenu.Items.Clear()

        'Declare a context menu item
        Dim contextMenuItemMyItem As New RadMenuItem()

        ' Add the item
        With contextMenuItemMyItem
            .Text = "My Item"
            .Image = ' An Image
            .ToolTipText = "A Tooltip"
            .Enabled = True
        End With
        'Insert it at a position
        e.ContextMenu.Items.Insert(0, contextMenuItemMyItem)
        'Add a handler
        AddHandler contextMenuItemMyItemt.Click, AddressOf ContextMenuItemMyItem_Click

    End If
End Sub

Private Sub ContextMenuItemMyItem_Click(ByVal sender As Object, ByVal e As EventArgs)
    ' Do Something
End Sub

[Hilda Kenny]

I dropped the rcm from the toolbox and added it to the form. So in the designer I added my items.

Thanks for any help.

[Richard Slade]

What you're doing is correct. You can add a RadContextMenu and perform an AddRange on the ContextMenu to add the items from the RadContextMenu that you have dragged onto the designer. ( though you may want to wrap this in) ...

If TypeOf e.ContextMenuProvider Is Telerik.WinControls.UI.GridDataCellElement _
AndAlso GridView.SelectedRows.Count > 0 Then

 ' Add Range here
end if

What does the stack trace read for the "Cannot remove the specified item because it was not found in the specified collection
" message? 

My first guess is that it is not related to the menu item being rendered but that on click of the item the first time round, you are removing something from a collection that you are affecting which is now no longer there. 

[Hilda Kenny]

Hi, I'll get the stack trace once I get my app running again with SP2, Thanks for the reply.

[Richard Slade]

Hi Hilda,

Did this work for you?
Richard

[Martin Vasilev]

Hello gyus,

I have tried the scenario that Hilda has and the menu items have been added correctly. I am using the latest official Q2 2010 SP2 release. Hilda, please try the latest version of RadControls and let me know if you still has any issues on that.

Richard, I have updated your Telerik points for your help on this topic.

Sincerely yours,
Martin Vasilev
the Telerik team

[Hilda Kenny]

Hi,
Sorry about the delay in getting back to you.  I have it working now.  I uninstalled the controls and reinstalled. I added all the references manually instead of using the project update utility and added the controls manually to the toolbox.  It works now, so maybe the update utility had something to do with the error. Thanks for your posts.

[Martin Vasilev]

Hi Hilda Kenny,

I am glad that you have managed to resolve the issues.

If you need further assistance, feel free to contact me.

Kind regards,
Martin Vasilev
the Telerik team