For the desired customization you could modify the built-in dialog (LinkManager) with the desired elements. This approach is described with step by step demonstration in this online demo
About the InsertSpecialLink
tool I suppose that you are trying to use the dialog from our Custom Dialogs demo
. In addition to complete this customization you should have the InsertLink.aspx
file in the root folder of the application with accordingly implemented logic.
When a custom dialog is used, its implementation is in a different aspx
file, which is called via request trough the showExternalDialog()
Currently I can only make assumptions on why this warning is thrown, although I can suggest you to check if the tool's name is the same as in the CommandList["ToolsName"]
Let me know if you need further assistance on this matter.
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