The article shows how a custom DropDown tool can be created. Typically, built-in dropdown collections can be configured via ToosFile.xml file with the corresponding tags, e.g., Paragraphs, Styles, etc.
However, when it comes to custom dropdown tools, this is not a valid approach, they can be defined only in the markup and in the code behind.
The reason for that is that for the ToolsFile.xml file to work there is a logic that parses the XML file. And when it comes to custom tools, there is no strict values that can be parsed so that they can work in every situation there is.
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