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This designer tool is built as well using the SWAT framework controls. The list of existing repository objects already available to be used is automatically displayed and one can choose or search for an individual one to maintain it or create a completely new repository object
A list of already predefined "empty" controls commonly used is available in the repository and they can be looked up for by filtering the objects having the names prefixed with "SimpleSwat" (make sure you use "*" in the filter)